Well, apart from lube on sticking door handle, bonnet release and squeaky rear bootlid struts, did the first minor fix on the car since getting it.
The strap that keeps the petrol cap tethered to the car had rotten away and it's really annoying not having it.
So, order new strap from flebay. Actually, two in a pack, including the pins that may also be needed.
Gently lever off the rotating cuff, push out the thin pins, pull out the rotten strap.
A bit of silicone spray to clean the cap and help lube it.
Push in new strap, press pins back through it, slide it back onto the cap, hook the end of the tether onto the catch in the opening flap, job done.
All straightforward enough and means I can do those occasional fill-ups without leaving the petrol cap on the roof!