He is off his food, sadly.
He'll occasionally perk up and clear his plate, but Mum can't predict it, and she's with him 24/7.
Whenever I've been there, even the offer of a chocolate, or some really good cheese has been met with, "No, I'm okay." And that is sad, because the way to his heart used to be through his stomach...
I bought a little bell from the carboot sale - 50p.
Will drive Mum mad

That'll be the first thing that goes to the charity shop!!!
Although maybe I'll talk to her quietly and suggest she uses it instead. In their enormous flat, the sound will carry much better than a shout. She can ring it from the computer/ dining room and I bet he'll hear it in the living room (half a mile away). Then again, he'll probably pick up the phone or try to work the intercom...
Blew up this photo for Mum.

Going to get a blank frame from somewhere like Hobbycraft and decorate it. Saw a lovely idea using only glue and egg cartons. Either that or wallpaper offcuts, sanded down to make a shabby chic look. Can you sand something down with a nail-file? I have more of those than I do nails...