Seriously, claim it for all the parts seperately, new. They expect you to give them the price of the parts new cos thats how much they will cost you to replace. If you have the right cover, you should definately get compensation, there arent any clauses saying you should have been more careful or anything like that, the whole point is that if something like this happens then you can get it back with as little fuss as possible.
Ive claimed a few things back, a mobile phone and an MP3 player i got stolen off of me when i was nowhere near my house and i got £500 for them :huh: