Gareth Thomas believes a fast start is vital for Wales in their quest to claim an odds-defying victory over Guinness Six Nations title favourites Ireland on Saturday.

Wales have been largely written off, heading to Dublin after suffering nine defeats in their last  10 Six Nations games to face an Ireland side chasing successive Grand Slams.

Andy Farrell’s team have won 38 of their last 40 Tests at home, being beaten only by England in 2019 and France two years later during that time.

They are also closing in on a Six Nations record-equalling 11 successive wins, remaining undefeated since France toppled them two years ago.

And Wales must halt a poor recent Dublin record, having not landed a Six Nations win there there for 12 years when Leigh Halfpenny’s late penalty secured a 23-21 triumph.

“It is obviously going to be a challenge for us,” Wales prop Thomas said.

“But talking to the boys in the week and last week and saying how exciting it is if we get it right in terms of what we need to do, it will be a class challenge for us.

“It is going to hurt, but it is going to feel good if we get those bits right.

“I think starting fast, just going at them, not accepting their style of play, because if they get what they want they will be very good.

“I think just going after them, going at them, beating them physically, if we don’t start like that then we have no chance.

“They are playing some really good rugby at the minute, but watching the first two games (against France and Italy), people are letting them play like that.

“So it is up to us to go at them defensively and stop that smooth kind of attack they have got.”

Much has been made of a new-look Wales Six Nations squad, with Test rookies like Cameron Winnett and Alex Mann performing impressively during narrow defeats against Scotland and England.

Bath prop Archie Griffin joined them in making an international debut during the tournament, and 20-year-old Cardiff forward Mackenzie Martin will follow suit if he features off the bench this weekend.

And while Wales might no longer have the services of players like Halfpenny, Louis Rees-Zammit and Dan Biggar available – or, for the current Six Nations, injured trio Jac Morgan, Dewi Lake and Taulupe Faletau – green shoots are evident.

Thomas added: “We have lost a lot of senior boys, which is always difficult, but I am enjoying trying to help the younger boys who haven’t had that experience yet.

“We have got a group of young boys who are listening, learning and working really hard, so there is a good energy about the place.

“It is such a fine margin in terms of getting those two games to be wins (Wales lost to Scotland and England by a combined margin of three points).

“Give us those two wins, and we are in a very good place.

“The amount of effort that has gone into those first two games, we are going to need the same again, but close the game off a little bit better as well.”

Warren Gatland has made seven changes for Wales’ Six Nations appointment with England after a first-half display against Scotland he admitted was “nowhere near the standards we expect”.

Wales head coach Gatland named the team 24 hours earlier than originally planned, with his line-up including a new front-row and centre George North’s return from injury.

It will be North’s 50th Six Nations appearance, while fly-half Sam Costelow, who went off injured during the first half of Wales’ 27-26 loss to Scotland last weekend, is replaced by Ioan Lloyd, with Tomos Williams at scrum-half.

Gareth Thomas, Elliot Dee and Keiron Assiratti forge the front-row unit at Twickenham on Saturday, while Cardiff flanker Alex Mann is handed a first Wales start following his try-scoring appearance off the bench against Scotland.

Wales went 27 points down to Scotland before staging a stunning second-half recovery, scoring 26 unanswered points, although it could not mask how poor they were prior to that.

Gatland said: “We have been critical and tough on ourselves this week.

“That first half was nowhere near the standards we expect. We simply cannot start the same way this Saturday.

“We showed in the second half against Scotland what we are capable of. Now it is about building on that performance and playing with some tempo from the off.

“We’ve made a few changes to the starting line-up this weekend, which gives opportunities to the players coming in. We need to be accurate and keep our discipline.

“This is a massive game, not only because of the history and what it means to everyone in Wales, but it is an opportunity to get things on track a bit more.

“England are in a rebuilding phase. We will go there with a lot of confidence we can build on that second half.”

Uncapped Bath prop Archie Griffin has been named on the bench, where is joined by Racing 92 lock Will Rowlands.

Rowlands linked up with the Wales squad earlier this week after his partner recently gave birth, while there are also chances among the replacements for Dragons pair Taine Basham and Cai Evans, who is the son of former Wales captain Ieuan Evans.

North has recovered from a shoulder problem to face England, with Lloyd now starting following an outstanding contribution after taking over from Costelow against Scotland.

Mann’s promotion to the starting line-up was expected following James Botham’s withdrawal from the squad because of a knee injury.

Williams, Dee and Assiratti, meanwhile, all made major contributions after being introduced for the second 40 minutes last Saturday.

Wales have not beaten England at Twickenham in the Six Nations since 2012, when centre Scott Williams’ late try confirmed a Triple Crown triumph.

After defeating England away from home during the 2015 World Cup, Wales have lost to their fierce rivals seven times in succession at English rugby headquarters.

Gareth Thomas knows from painful experience the misery that Georgia’s forwards can inflict on opponents.

Wales need one point from Saturday’s Pool C finale against Georgia in Nantes to guarantee topping their group.

With a quarter-final place having already been secured for the fourth successive World Cup under head coach Warren Gatland, they are building towards an expected last-eight appointment with Argentina or Japan.

But before that there is unfinished business for Wales, even though Georgia are already out of the tournament following losses to Australia and Fiji either side of a draw with Portugal.

Ospreys prop Thomas will line up at Stade de la Beaujoire as the solitary survivor from Wales’ starting pack against Georgia in Cardiff 326 days ago.

He played just over an hour of what became one of Welsh rugby’s darkest days – a 13-12 defeat that effectively signalled the end for Gatland’s predecessor Wayne Pivac.

Two Jac Morgan tries helped Wales build a nine-point lead, but they were overhauled when Luka Matkava kicked a penalty two minutes from time that put Georgia in dreamland.

Asked about Georgia’s scrum threat, Thomas said: “Yes, 100 per cent. That is what won them the game against us in the autumn last year.

“They are just such a physical side. Set-piece stuff we have to be on top of our game, as we know they are going to come strong.

“We have come a long way since the start of the summer, but we know this week will be a big test for us.”

Only an eternal optimist would have predicted Wales’ status as World Cup quarter-finalists just over a year after that Principality Stadium debacle.

A poor Six Nations followed, when victory over Italy in Rome staved off the wooden spoon, but Gatland has once again weaved his magic.

A 12-year first stint in the job produced Six Nations titles, Grand Slams, two World Cup semi-finals and a brief spell as world number one team.

And three games into their World Cup campaign, Wales have a 100 per cent record and are strongly fancied to make the last four.

Thomas added: “We want to keep the momentum going that we’ve had over the last few weeks here, trying to hold onto that and push and grow as a team as we go forward to the quarter-finals.

“We are a completely different team to what we were last year.

“There has been a massive improvement in the squad, but we know that they are a very good side and we have to be on top of our game to be successful this weekend.

“It is the time we have spent together and the amount of work we have put in together. You cannot fault the amount of effort that has gone in this summer.

“The confidence within the team at the minute is something I haven’t felt before. We are in a good place.”

Gareth Thomas says it would be “an amazing feeling” if Wales beat Australia and book a Rugby World Cup quarter-final place one game inside the distance.

Wales tackle the Wallabies in Lyon on Sunday knowing that victory would confirm one of the two qualifying spots from Pool C.

England or Argentina are then likely last-eight opponents in Marseille next month, with Wales maintaining a 100 per cent record of reaching the knock-out phase under head coach Warren Gatland during four successive World Cup campaigns.

Wales then have a break next week before completing their group schedule against Georgia in Nantes.

“When we came here we always wanted to win all the games in the group and nothing has changed,” Wales prop Thomas said.

“We’ve got the same mindset. We want to go out there and perform and get the win.

“That would be an amazing feeling wouldn’t it, getting the third win? We don’t want anything but that. We are looking forward to this weekend and then we will have a couple of days to recover after that.”

While Wales occupy the box-seat, Australia must win to have any chance of progressing from a pool that also includes Fiji, Georgia and Portugal.

A 22-15 defeat to Fiji in Saint-Etienne last weekend has elevated the prospect of Australia not progressing to the quarter-finals, which has been their minimum achievement in all nine previous World Cup campaigns.

Australia’s record in the tournament against Wales is a good one, though, having toppled them five times from seven attempts, but the latest meeting will undoubtedly see them weakened by injured forwards Taniela Tupou and Will Skelton missing out.

Thomas added: “They are always going to be dangerous when you play against them.

“We wanted to come here with the mindset of winning all the pool games, and nothing has changed for us. So whether they have won or lost, it doesn’t change anything for us.

“We take a lot of confidence from the Fiji game and Portugal game and what we’ve done all summer, really, and feel like we can only get better as well.

“We know it is going to be a big, physical contest and we are looking forward to getting out there.

“It doesn’t really make any difference to me whether they (Tupou and Skelton) are in or not.

“We’ve got our heavies behind us – Will (Rowlands) and Beardy (Adam Beard) and Daf (Dafydd Jenkins). They are all heavy boys and Christ (Tshiunza) as well. We’ve got plenty of power ourselves.”

Thomas is among 16 Wales players involved in a first World Cup campaign and he is relishing the experience on and off the pitch.

Wales assistant coach Alex King has compared the squad to a “band of brothers”, and Thomas said: “There is just something special about every game in the World Cup, so we are watching them and just enjoying them because there is a big buzz about everything.

“We have fines committees. The (latest) sheet came out with all the fines on it and Nick Tompkins racked up a decent bill.

“He wore the wrong T-shirt and he was a little bit late for monitoring after the Fiji game because his alarm didn’t go off. It’s all good fun.

“I am on environment, so making sure everything is clean and taking the empty bottles, putting them in the bin. That’s my job, the guy who tells everyone to clean up their own stuff.”