Finally after hunting months I've got my Mini Cooper S

I had it for a great price and it's got loads of extra's, but the only thing missing is a sunroof and a
JCW Kit.
I've got alot of money left over so I was considering having both? I've looked into getting a
JCW kit, had loads of quotes for just the kit to fitting so I've got that sorted, but I have no idea how much a sunroof would cost to install? I would like to go to BMW so I can trust the work.. I was hoping it wouldn't cost more than £800, or am I dreaming?
Anyone got any information? or is it even possible to add a sunroof after the car is made?
Thanks x