Looks like the seam round the expansion tank is leaking. I guess it's a simple fix of a new tank, but I just wondered if it was a known problem and if there is a better tank.
Bloody nuisance as I'm off to Wales tomorrow. Will tape it up and take a pot of top up fluid.
Removed, taped up and refitted old one until I get get a new one. Are the alloy ones easier to fit back in? Otherwise they must get scratched to buggery!!
