Morgan1 wrote:What would be your advice about price?
Hard to say without more detail, Craig.
Subtleties like paint/interior colour influence price as well, as do factory options, like a sunroof (am not a fan of those myself) or alloy wheels like the 16” Lattices or JaguarSport/TWR items.
The mileage sounds reasonable for its age, it having been off the road for nearly a decade AND the non-starting issue are excellent bargaining points if you are willing to take on a new project.
My suggestion is to either go and see the car in real life (if covid measures allow for that, of course!), or ask the seller for detail pictures of known weak spots.
As Naki already mentioned, the bottom of the car is a very common rust spot, as are the front/rear windscreen surrounds. Wheel wells, sills, bonnet and boot lid edges would also be good to be seen in more detail...
Mine was virtually rust-free, so not a lot of first-hand advice I can offer in that area.
Interior: some issues are identical to XJ40, like peeling veneer on ski slopes and sagging headlining.
The rarer the interior colour, the more important its completeness and condition will be.
It’s not a lot, but I do hope this helps a bit...