Check flasher can - under driver's shin bin, on the right.
It's probably the hazard light switch, because it is so little used the contacts can corrode up slightly and not make contact any more especially after being used after being dormant for a while. Try operating the switch a number of times until it starts to work again, if you can give it a squirt of switch cleaner as well, so much the better.
Thanks -I'll check that too.
hadnt realised it had significant importance to the system.
Cant think the last time I used it - must be years , and then not for any particular event, just to test the unit.