My hazards have stopped working in my 1.3 1988 Mk2, Didn't realize till it failed the MOT on them

What happens is when they are turned on the green dash light just remains constantly on, with no ticking or flashing at all & No indicators come on.
All the indicators work perfectly on their own, so it is not a bulb. And when the relay for the indicators is removed, the same problem as the hazards occurs, green dash light on constantly with no ticking or flashing. I would have thought they would have been on the same relay but obviously not? Am I missing something, does it sound like it even is the relay?
Could anyone tell me which relay is teh hazards?
Thanks!