Very sad to hear you are not well Mark and I wish the best for you.
Very hard to price your Z without knowing it but prices are strong so use what is out there for sale as a guide and go from there.
That's 11 mot straight passes in my ownership. At one stage their were five mot testers looking at the engine. Well p!eased and this week I changed the oil and filter, Brembo front brake pads and two Toyo front tyres.
A Jap car group put an add up for traders for their next show and noticed my Z in the background. Nice to spot your Z when not expecting it.
https://www.facebook.com/photo/?fbid=287285640304539&set=gm.707111824506457&idorvanity=543618457522462