I am in a similar situation and have done/or will do the following:
Wheel refurb - the paint is coming off in loose slivers along the sides of one or two of the spokes and there is some kind of marbling effect on some wheel paint, so a refurb is on the cards but not urgent.
Stone chips - had the bonnet repainted 2 yrs ago and it was a great job, undistinguishable from original and other panels - John Alker, Adlington.
Detailing not particularly needed
Drivers seat refurb - deep creases in drivers seat but not urgent
Rad replace - no evidence of any issue
Suspension update - Will not get done as the suspension is firm enough and the ripoff Insurance companies will crucify me for the change.
Underbody cleanup and attempted rust prevention - It's pretty awful underneath but not too bad or MOT risk. A specialist said just keep it dry and put up with the unsightly look as the damage is already done, just try to halt it where possible. Maybe a dinitrol?? - BTW it does not go out in the rain!🫡
Exhaust update - done - H&S catback sounds awesome.
It's gonna cost me to bring it out of SORN after winter - tax, insurance, major service, MOT but I just hope I can afford to do it in June - approx - 735+625+775+45 = 2180 or thereabouts OUCH! I could get a week in Spain in a 5* hotel for that!😬