Hi thanks for the offer of Mallory Park but I'll be busy, but I'm at a trackday at Cadwell Park on Wednesday 6th ( Moto Morini club) if your free pop along it's supposed to be a good day.
If your still looking for seat ideas I've got a period RS850 seat you could try (Nottinghamshire based), that is true 80s endurance, take a look at my rs850 build page.