If it doesn't have service history run. Youl find it hard to sell on and may bring up problems in the future.
You are looking at £7-900 for an inspection 2, like said the brakes are expensive, the body work sounds like it will cost you a fair amount a front bumper respray will be £260+, wheel geometry is about £60-100, tax is £460 then your insurance, tyres will be £350+ for two fronts depending on the brands. So you are already in a lot of money you wont see back.
Sounds like it has too much work to make it worthwhile especially with it being a press car, when you can get perfect Z4MRs for so cheap now. Unless it is very cheap which im guessing it isn't.