To get it out of the way - can't do a diagram just now!
So, I was parking in town taking my mum to the bank. She has a disabled badge. There is a single disabled spot in a sort of bay at side of the street, near a junction. Pavement behind amd yellow lines in front. Big space, but not big enough for 2 cars. As I'm getting out of the car another car pulls in behind (car nose in space, back in the road). Driver asks if I can pull forward to let him in. I say it's a single space he says it's clearly a double space, I should be able to see it's a double space. I get back in and drive forward probably about a foot - to the end of the space, just before yellow lines.
He says I need to move further forward, that I should park on the yellows. I tell him I'm not doing that, that it's dangerous to park so close to the junction. He's getting cross and shouting that it's fine, that he knows what he's talking about and I need to move. I ignore, lock car and head off.
We're only 10 minutes, when we get back to car he has parked with half his car on the pavement and the other half in space behind me. He's still there shouting about how inconsiderate I've been, that I can see it's a space for 2 cars etc. I ignore and he walks away. (Shop owner who's been watching and listening to whole thing then comes out and offers me and mum some sweets).
Who the he'll did the Parker think he was? Would you have moved onto yellow lines to let him park? (There were available disabled parking spaces available round the corner)