The inlet valve in the cistern wasn't working properly, so I sprayed the adjusting screw with my trusted WD40 and adjusted it, without breaking anything! "That'll do the trick". What an optimistic fool!!!!! The valve just would not fully close.
I had to go and get a little shopping, so I called in at Mt Shawkey's plumbing supply shop and bought a new one. Problem number 132, the float fouled on the back of the cistern. Back to the shop, where Mrs Shawkey was now sitting with her husband and shop assisting (he's a trained lawyer) son. Introductions complete, she told the son that she loved my hair!!! Mind you, I think it was a stab at her husband whose hair is turning silvery grey, but he likes to dye it!!! Never mind that, though. Sorting through their selection of differing valves I found the ideal one, which was another tenner (what a surprise there, then).
Here's the box; "Gold" flash, eh?