NOT many teenagers can say they spent the summer between leaving school and starting university making a movie.

Even fewer can say they made a movie with Billy Connolly and David Tennant.

But that's exactly what happened to 19-year-old Lewis Davie, who spent the summer of 2013 filming What We Did On Our Holiday, the first movie from Andy Hamilton and Guy Jenkin, creators of hit TV comedy Outnumbered.

Lewis plays Connolly's grandson Kenneth in the movie, and though he was thrilled with the whole experience, he says he got the part somewhat by accident.

"I wasn't really an actor, although I'd done plays and musicals at school. I was in sixth year and an email came round saying a feature film was being cast.

"There was a bit about the character and I showed it to my parents, who said it sounded a lot like me, so I thought there was nothing to lose."

According to Lewis, the first audition in Edinburgh wasn't anything like he expected it would be, nor did he think it went very well.

"It was just a small room with a tripod in front of my face and me sitting really awkwardly, but the character is a bit awkward so I played to my strengths there.

"I felt so out of my depth though. I read out a scene and nothing felt right.

"But then after a few days I got told there was another audition at Filmcity in Glasgow, this time with Andy and Guy.

"That was a lot more fun, because they've got a way with comedy."

"A few days before I found out I got the part, I went online late at night to see who else had been cast and freaked out and couldn't sleep after that.

"I didn't grasp the scale of it until that moment, but then when I finally got the part I couldn't sleep for days after that."

Lewis filmed most of his scenes at a Georgian mansion on the Finnich Estate not far from Drymen, as well as locations up the West Coast including Gairloch.

"I'd never been to the Highlands until we did the film," he says.

"But it does so much for Scotland the way it's portrayed, the big wide-screen landscapes, you can't help but be amazed at how beautiful it is."

Lewis loved the location and scenery, with just one complaint: "Oh, the midges! They're so bad you can actually see them in the film. They'd just rise up out of the ground in a black cloud and you can't escape them."

He spent his first day just seeing how the whole filming process worked, before being eased into filming.

WHAT surprised him the most was just how much fun it was, which Lewis says came from the directors.

"I didn't feel pressured in any way, which was mainly due to the atmosphere that everyone built up," he says.

"Especially with so many kids in the film, they wanted to keep it light and make it friendly, so the kids can just be themselves.

"It felt more like an extended holiday than working, just having fun all day and playing music.

"I even did a bit of improvisation. I had a scene where I had to argue with Ben Miller, and that was just me being me, which led to Amelia Bullmore, who plays my mum, saying: 'I had no idea we raised such a pretentious child'."

Of course, it's sharing the screen with Billy Connolly that was such a highlight for Lewis, and he says that hanging out with the legendary comic in between takes had him crying with laughter.

"He's just hilarious. He tells the funniest stories, and we spent a lot of time just chatting and playing music together and enjoying life."

Lewis brought several of his own instruments, including his banjo, on to the set, and reveals he was secretly hoping Billy might want to have a go.

"He actually fixed it for me, because I'd had had some tuning problems," he says.

"So we had a jam and played a few tunes, me on my violin, Ben on the guitar and Billy on the banjo playing Foggy Mountain Breakdown."

Music is a big part of Lewis's life, having played violin since the age of seven. He picked up the guitar at 13 and the banjo a couple of years later, while he can also play a mean ukulele, too.

While the film is released in cinemas today, Lewis's debut EP, Limerence, is launched next week.

He's been working on the songs for more than three years, taking in styles from ballad to blues to folk, and he gigs regularly in between studying computing at university in Dundee, his home town. As for whether he can see himself taking up acting as a career, Lewis says he's open to whatever comes along.

"If the opportunity was to come up again then I'd absolutely do it.

"But if I'd known I was going to be in a film where I played the violin, I'd have practised a lot more."