Just found out that some bloke who my(i) firm does work for has an E plate S2 (white) stuck in a barn/garage with 56,000 miles from new, 2 or 3 owners including him. Totally standard. Its been stuck there for 5 years and never moved

, i have'nt seen it yet but he's letting me know how much he's wanting for it if he decides to sell it (quietly confident he will tho). Not sure what its worth as i have'nt seen the condition of it yet... should imagine it'll need a good engine service etc before starting plus other parts freeing off and a good clean up.
Provided the storage has no leaks and the cars straight & solid, what do you think it'll be worth roughly? Sorry, i know its hard to say from what i've told you.. just after some examples considering its been stood flat for 5 years without being started at all. Cheers
E plate
Standard
56,000 mile (genuine)
2 or 3 owners (can't remember now)
Not moved or started for 5 year
Apparently it looked mint until he got a new car and garaged/forgot about the Series 2