"There are a few things that you want to do in life," says James Corden. "Work with Mathew Horne, kiss Harry Potter, and make films about lesbian vampires."

Mat Horne, James Corden, Paul McGann and MyAnna Buring.

His work with Horne is well documented in the critically-acclaimed comedy series Gavin & Stacey, and his encounter with Potter star Daniel Radcliffe on stage at last year's Whatsonstage Theatre Awards is all over the web. RT has travelled to 3 Mills Studio in the east end of London to watch him, and Horne, get to grips with that third ambition on the set of Lesbian Vampire Killers. On a soundstage at the back of the lot we're in an overgrown forest locale, replete with vines choking stone sarcophagi, which are strewn about the site like they've grown wild. With us, amongst the workmen and technicians that usually populate a film set, are 12-15 women dressed so scantily in semi-transparent silk that they may as well be naked.

"It's all about being surrounded by women," Corden laughs. "That's the idea for life, isn't it? I imagine most people that work at Rotten Tomatoes are doing it to get women. Every man's quest is doing stuff to get women..."

Silvia Colloca, as Queen Vampire Carmilla - gets to grips with Corden and Buring.

In the true spirit of fantasy horror, we witness shooting on a scene in which Horne and Corden, with co-stars Paul McGann and MyAnna Buring, are literally fighting off the advances of a Vampire Queen and her troupe of similarly-sexy vamp vixens. Horne is pointing a crossbow and Corden is swinging condoms filled with holy water -- or, at least, he is until one bursts all over him, prompting a retake and a decision to be less vigorous next time.

It'd be easy to assume a film like this doesn't need much of a plot providing it's at turns funny and titillating, but there most definitely is one, they insist. "I play a character called Jimmy, who's been dumped by his girlfriend," Horne tells us. "And James plays this character called Fletch, who's lost his job. We'd like to get away from it all, but neither of us has any money, so we end up on a hiking holiday in this cursed village, where we encounter lesbian vampires."

Horne and Corden charge into battle. Big sword jokes abound.

"Do you like Mike Leigh's films?" asks Corden, with a glint in his eye. "It's very similar. It'll definitely be a front-runner come awards season!"