Hi Peter, thank you for taking the time to reply.
The screw that secures the hinge to the toilet base snapped (see photo). So that complete hinge bit will need replacing.
As for the seat, the two rod things that slot into the hinge, one moves freely and one doesn’t. I’ve tried to get it moving, thinking maybe that is what caused the hinge to snap in the first place? Not sure if it has seized up somehow but I can’t get it to move at all. Maybe it was never meant to move? I don’t remember. Again, see photos.
Model no. See photo, is the number you require?
I thought maybe I could just get a standard seat and lid with hinge and screw into the frame as per a normal toilet, but actually on further inspection/thought, as you say, maybe that won’t be possible as the toilet isn’t flat like a normal toilet, it has a bit of a bend to it. I dunno what I’m talking about to be honest. I’m not a plumber. Just someone trying to fix my mums toilet. ??♀️