Jacob Bethell said that he would have asked to bat up the order on his Test debut had he not received a "surprise" invitation to do so by England against New Zealand. 

Bethell scored an unbeaten 50 off 37 balls after coming in at number three and also hit the winning runs as the tourists posted an eight-wicket win in the first Test in Christchurch.

"I would have asked for it to be honest," Bethell told BBC Sport. 

"I like batting up the order so I was really happy that opportunity arose. I've always wanted to bat in the top four, so three is perfect," added Bethell, who had not battled above number four in his first-class career where he has an average of 25.44 from 30 innings.

The 21-year-old was called up to the England squad as a batting cover, but found himself in the line-up after an injury to wicketkeeper Jordan Cox.

Bethell was dismissed for 10 in his first Test innings, but produced a quick half-century in the second as England chased down the 104-run target set by New Zealand with ease. 

"It's everything I've dreamed of," said Bethell, who hit eight fours and a six during his knock. 

"It lived up to expectations. It was so fun."

But Bethell will have his work cut out to keep his number three spot with Ollie Pope, who moved down the order due to workload management after wicketkeeping duties, being the regular for England in that position. 

"It was my first experience playing in front of packed grass banks, pristine outfield, good pitches and playing against a good team, so it was great," Bethell said. 

"To come out in the second innings and have a chance to walk off with an England win was at the forefront of my mind and luckily I was able to do that."

Born in Barbados, Bethell moved to England at the age of 13 and made his T20 and ODI debuts against Australia in September.  

He has scored three scores of 50 or more in 15 limited-over appearances for England so far, earning him a contract with Royal Challengers Bengaluru in the Indian Premier League worth about £245,000.

The second Test of the three-match series will begin in Wellington on Thursday.