Jonny Bairstow accepts he may not always have a spot in the England side

The 27-year-old cracked an unbeaten 60 off just 35 balls as England hammered South Africa by nine wickets at the Ageas Bowl on Wednesday in the first of their three-match Twenty20 series.

It was his first international half-century in the sprint format since 2012 as he has found himself in and out of the side.

The same can be said for one-day cricket, with Bairstow unused at the Champions Trophy until he was drafted in for the out of form Jason Roy in the semi-final defeat to Pakistan.

His place as wicketkeeper-batsman in the Test side is more secure but his performance in Southampton could now see him operate across all forms of the game - even if he must fight to be in the XI.

Asked how he deals with the uncertainty around his selection, Bairstow said: "By not worrying about it, that is the biggest thing.

"By being comfortable in yourself and in your surroundings, I think that is a major part to it and I think I have grown up a lot over the last three years.

"I'm not sure what I can put that down to but naturally you grow up from a boy to a man and learn different things, how to play, construct innings and go on different tours.

"Everyone wants to play...there is not much point worrying too much about it.

"I've been in squads, played and not played and been in different formats. If you pick every single bit of it apart you get yourself het up, there is more to life that that."

Bairstow intends to simply keep his head down and continue to plug away to make it difficult to be dropped.

"I'm happy with the way that I am playing and the way I am striking the ball," he said.

"If I am picked in the XI to play then fantastic, if not there is nothing I can do about it.

"All I can do is keep my preparation good, try and score as many runs as I can and keep as well as I can.

"I will just keep doing exactly the same, work hard on the things you are going to face and keep trying to build on that. I like to think I'm still learning and there is some hard work coming off."

Asked whether he tends to over-think the situation around his inclusion, Bairstow again pointed to his psychological development in recent times.

"I think I would have done 18 months, two years ago but I'm at the stage where I'm in and out, learning to deal with that is a skill in itself," he added.

"You have to deal with the fact that you have got to score runs but you might not be in for the next game.

"It is a philosophical way to be looking at it for a Yorkshireman but it seems to be going alright at the moment and hopefully it can continue."

Bairstow will be hoping for a similar outcome in the second clash with South Africa as England look to wrap up the series with victory in Taunton on Friday evening.

Meanwhile, England are on Friday likely to provide an update on Stuart Broad, who aggravated a long-standing injury to his left heel earlier this week that leaves him a doubt for the first Test against South Africa next month.

Broad was only able to bowl one over before leaving the field after the problem flared up once more while playing for Nottinghamshire on Wednesday.

Press Association Sport understands the 30-year-old underwent a scan on Thursday and England should provide a clearer indication of his status in the next 24 hours.

Broad has been managing his left heel for a number of years and wears special bowling boots in an effort to prevent injury.