So many films end up being filmed in London or in the same places over and over again.

I think 99% of the whole thing is to have passion about the idea yourself. I think part of your job as a filmmaker is to tell someone that might not think it's going to work that, actually, it will work.

We actually did go on a camping trip together as part of the research, in a caravan, for a week. I guess we picked who annoyed us most from genuine experience. We did a lot of research on camping and what annoys people. It's quite often children playing ball games. It's a huge debate in the caravan world whether children should be allowed to play ball games or not.

'Sightseers' started off as a character comedy double act.

It's nice to think people might be talking about it after they've seen it. With some comedies it's a bit 'wham bam thank you ma'am', and then you just go for a pizza.

I think it's very easy to get discouraged early on.

When I was a kid the highlight of my week would be doing a fossil hunt at the local quarry... that kind of thing.