It looks like the succulent Kalenchoe often called 'flaming katie'

it looks as if it could do with being repotted too.

I agree

As Sbg says, one of the many Kalanchoe blossfeldiana hybrids.

Thanks all, its due to be repotted again but we had no idea what it was, we found it on the windowsill at work hidden behind blinds in a sorry state, so was put in some new compost and now it's thriving.