Alex supplied my Cosworth panel filter...I recently also bought Denso Iridium sparkies from him as well. Think I paid £35-£40 for my DE engine filter. I think Rich is also selling Apexi filters at the moment as well.
I am in the same boat, strange ownership of my car, 1st owner was a navy commander who got called out to the Gulf soon after buying it so it sat untouched in a garage for 18 months. Then it went to another fella who did Nissan servicing but subsequently for its age is now a service behind.
So giving it a P10 service with my dad this weekend. Going to be doing everything from the drive belts, three oil changes (engine/gear/diff), sparkies as above, brake pads etc. Its going to be a nice drive home Saturday night!
Well worth doing as much as you can, keep all the receipts etc - always good for any potential buyer in future to see you have put time and effort into looking after it