The large place on the corner opposite Bombay Corner will be open if you fancy a quick brain or trotter soup, or something more normal
Ametyst opposite the taxis is normally open late, no doner kebabs this time of year but will do a chicken sandwich instead, and do great pides
Or as you said, the hamburger place.
We had a chicken burger recently and were really pleasantly surprised, had never been before and it was lovely!