Right, after much ribbing about my rear screen which has been cracked pretty much since I bought my S four years ago, I've now booked it in to be replaced. It will also have the scuzzy wheels restored and the fuel guage fixed!
Dropping it into David Batty's for the new fuel guage sender. Whilst it's in, he's getting his man to do the screen (~£120) and sending the wheels off to Spit 'n' Polish (~£38 per wheel).
David was going to bastardise one from a Griffith but then managed to lay his hands on two S ones. They are pretty difficult to obtain now from what I understand.