As the two leads you and Holly Grainger really click together. Was that chemistry instant?
"Yeah, it was. As soon as me and Holly met we really got on well and were always spending time together and having a laugh. Even after we'd finished we were always, like David and Emily, getting up to mischief and what have you."
How much fun was the preparation for the filming, involving you and Holly spending a week in a caravan park together?
"The preparation was really good because Tom [Harper, director] gave us a digital camera and said to us 'go round and take pictures of what you think David and Emily would do'. It was a time of bonding for me and Holly to build up the relationship that Tom wanted from the characters. It definitely helped."
When I watched the film, the audience had a collective gasp by a certain scene late on in the film. When you first read the script, how stunned were you by the shocking thing that David does in the cave?
"I never really understood it and when I was trying to explain it to my dad and my girlfriend I was like 'you love her, but you...' It was kind of a difficult one until you get the backstory from Jack [Thorne, writer] and when people start filling you in and letting you know all the other perspectives of it. It really does make sense."
Do you think David is really in love with Emily, or is it just lust?
"I think it's definitely love. Definitely."
How was director Tom Harper like to work with compared to Shane Meadows?
"There wasn't a massive difference because they both work similarly. They'll give you as much rehearsal time as you need and will always speak to you and they're not like your boss on the set - they're like your mate as well. They are very similar."
In terms of the working environment on the set, with all the cast and crew holed up in a holiday camp - was it as much fun as it sounds?
"It was really fun actually. I was only 17 at the time so I wasn't old enough to drink, so I couldn't go out into the clubs and stuff. A lot of people did go out clubbing and stuff, but most nights we'd sit around the caravan park and watch the corny entertainment and have a laugh and play pool. By the time we'd spent 12 or 13 hours on set we were all really tired anyway. But we did have a really good laugh."
How hard was it filming one particular scene that features David in the sea
"It was very hard. The time it was shot it was freezing and we couldn't have thermals. It was really difficult and really cold. It was in the first two weeks we did that."
It looked like the sequence in which you pretend to be a sheepdog was a lot more fun - or were you attacked by any angry sheep?
"Yeah, that was fun - a great laugh. I don't like sheep and I'm quite scared of them, but they were scared of me as well! When I ran for them they ran away so we kind of helped each other out! Me and the sheep had ourselves a little relationship going on."
Do you often wonder what your life would be like now if you hadn't have stumbled upon the audition for This Is England back in 2005?
"Yeah, I do. I think it would be really different. I'd be working in a fish factory or somewhere like that. Now I'm 18 I'd be working on an oil refinery with my dad."
Have you received any scripts from Hollywood since landing a prestigious acting award at the Tribeca Film Festival for Somers Town?
"No. I had an audition really, really early on in my career - literally just after I'd finished This Is England - for Steven Spielberg and that was for an American TV series but I can't remember what it was called. It was something to do with a fairytale."
Did you meet Spielberg himself?
"No, I didn't get to meet Steven. I just got to meet the casting director."
One day though...
"Yeah, hopefully, hopefully! Ideally I'd like to stay in British films though - and good films - working with Shane [Meadows] and Tom Harper."
The Scouting Book For Boys is on limited release from Friday.