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

The film [Sightseers] is really the story of the journey of a relationship, so the killings are almost a metaphor for the trials they go through. We wanted people to identify with the experience of going on holiday and having a quarrel with your wife, boyfriend, whatever. We knew if we didn't crack that it would not be watchable as a film.

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

Manchester has a certain reputation of being cool.

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.

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.

If you can make someone believe that you believe in the idea then I think that's worth a lot.