Crushes, Cliques and the Cool School Trip by Karen McCombie
Ally was sort of looking forward to her week away on the geography field trip. But how much fun is she going to have with Feargal O' (ex-not-quite-boyfriend) Leary plus his obnoxious mates bugging her the whole time, together with Sandie's homesickness for Billy (aka Baby Bear - bleurgh)? Thank goodness Kyra's coming along for a bit of light relief...But when they finally arrive Ally and her mates have only been there two minutes before some gang of moronic girls from another school has got it in for them - what on earth have they done to deserve that...?