It's not my opinion on the bike - I've never ridden one.
Just that a P7 generally goes for something around £220 give or take, depending on various factors.
But with a poor pic and 'aluminium' in the title who's gonna take the risk?
That said I have a C16R which is very nice and a P7 is a step up so I think £220 for a P7 is about right. In fact I think bikes of that era are great value.
I'm not even sure its 631 (could be wrong) but a prestige/631/Orange proprietory 'prestige' frame with decent components has gotta be worth a couple of hundred I reckon. You can barely buy a new bike for that.