Mystery house plant
Now I'm assuming this is a house plant. Our son bought it for his Mum on Mother's Day about 3 years ago when it was about 3" high. It had small pale pink flowers. I think it might be about to flower again. Some kind of begonia?
edited December 2019
Khalancho or "Flaming Katy"
The north west of south east Wales
Kalanchoe blossfeldiana. Pretty easy going plant. Just give it bright light and don't over water it. You might want to feed it before it flowers. Use a specialist succulent feed that isn't too high in nitrogen.
Thank you both for the ID. I did assume it was a succulent by its leaves but that was as far as I'd got. The compost was bone dry until I watered it today.