E60 Timing chain advice

[Nroantree]

E60 520d manual with 108k miles needs timing chain replacing, black leather interior, rear tints, excellent condition, Id like to ask for advice on roughly how much I could expect to get if sold in current condition. Still drives, full tax & M.O.T etc.

Dealer quoted £2250 today for work, local BMW specialist £1800. Trying to figure out if I should pay for repair (not that I can afford it at the mo) or cut my loses and sell, disapointed either way.

Thanks all!