thanks for comments everyone, and I did ask him if he had a kettle lead! (he dodged the question). I was surprised to see it had sold - it wasn't sold to me, we had 5 messenger exchanges, responses all within 10 mins, I said I'd take it and asked about arranging delivery (he'd already agreed to courier) and then he didn't respond.
To say it's sold is not strictly true. He put it on Facebook at the same time that he put it on ebay. It's still live. I suspect he thinks he might get more for it on ebay
https://www.ebay.co.uk/itm/26536614...d=link&campid=5338728743&toolid=20001&mkevt=1
I'm no longer interested and would warn others off too. He told me it hadn't been used in 20 years and he didn't know if it worked. At £20 this is fine but he's made no mention of it being untested on the ebay ad and if it goes for £100 to an unsuspecting buyer, that's disingenous to put it politely.