Hi Fraser
I know this S-Type as I have worked on it and it's generally a very tidy car all round.
The owner has rectified a few of the known issues and fitted many parts recently (Thermostat Housing, Brake Servo, Service, etc)
https://www.gumtree.com/p/jaguar/jaguar-s-type-2.7-diesel-sport-2005-manual-gearbox-75k-miles/1349410603
It's based in Dorset and I think he'll shift a little on the price