Last night whilst driving home, I noticed that all the drivers side indicator lights were constantly on (not flashing, but constant illumination) even though they were not activated. Front, side repeater, rear and internal repeater were all on constantly.

No sooner had I noticed it, everything returned to normal. This morning when I started the car, all the drivers side indicators came on again and would not go off.

Any idea what's going on ?

Could be something to do with alarm fitment (depending on whose) as they are usually connected- to flash when alarm activated etc. Dealer/alarm bods should suss it pretty quick.