Agree about the clutch and brake fluid. Might also be an idea to swap out the coolant as its close to 5 years old now. Personally I'd want the gearbox and axle oil changed too - for peace of mind really. ( The oil in my diff at 3.5 years and 8K was pretty dark - advised by Morgan whisperer Cain @ Wolf to do it).
I would expect a service cost to be £500-700 as a guess.
