Kiss Me and She's Like The Wind did cross my mind - although I was thinking of SLTW for Olly, could see it working for Joe too
Lucie - Can't Fight The Moonlight (LeAnn Rimes, Coyote Ugly), love this song choice but if not, maybe Nobody Does It Better (Carly Simon, The Spy Who Loved Me)
Stacey - Don't Get Me Wrong (Pretenders, Bridget Jones's Diary) or even Just A Girl (Romy and Michelle's High School Reunion) or Lay All Your Love On Me (ABBA, Mamma Mia) or if she could handle the choreography, Flashdance... What A Feeling (Irene Cara, Flashdance) Should be a good week for the girls
Joe - Sandy (John Travolta, Grease) - would also suggest Rule The World (Take That, Stardust - love the song but it's been used on XF before and I always try to pick songs never before used in the live shows lol

)
Lloyd - About A Boy (Badly Drawn Boy, About A Boy) or Thunderbirds Are Go (Busted, Thunderbirds)
Jamie - Hero (Chad Kroeger, Spider Man)
Danyl - The Sweetest Goodbye (Maroon 5, Love Actually) - seeing as Simon doesn't mind using non-singles for Danyl, it is from a huge film and a huge album
Olly - If not SLTW....hmm, I'm A Believer (Shrek) maybe? He could also do Have You Met Miss Jones (another Bridget Jones song, by Robbie) or a De Lovely song (probably De Lovely itself, also by Robbie lol) - might be a little too predictable though
Jedward - If none of the above, which are all excellent ideas, any parody, romantic duet or song containing a spoken section could work well for them! A few obvious contenders have been mentioned here, will see if I can think of any more!
I don't actually watch many films, so I suggest a similar range of songs every time this theme is used, but my suggestions are never used! Grrr!
xxxx