Speaking about their on-screen chemistry, Emma said: "On screen kisses are never nice and you sort of dread them. We know each other so well we are like brother and sister, and everyone on set was teasing us about the day we would have to kiss. But actually Rupert's a real gentleman and if I had to kiss anyone I'm glad it was him. There were no tongues involved."

Rupert added: "I filmed the kiss with Emma on the next movie a couple of weeks ago, it was weird. We've known each other so long and neither of us really wanted to do it but we just had get on with it, get into the character and then is was quite nice, but we were in a scary place to begin with."

Daniel Radcliffe told us about his on-screen snog with Ginny Weasley, played by young actress Bonnie Wright. He said: "My kiss with Ginny was a lot more gentle but still passionate, it took two days to film.

"It was tender and romantic. Dan's a good kisser - he's the hero of the film." But when pushed to comment on the experience with Daniel, rather than his on-screen character Harry, Bonnie would only say: "I can't judge it in that way, it was just acting."