The left indicator on my Peugeot 106 keeps getting stuck 'on' - help!?

Peugeot 106. T reg.

The majority of the time the indicators function perfectly, however every now and then the left ones seems to get jammed and stuck on (by on I don't mean flashing like usual but front back and side constantly lit). This problem usually occurs when locking or unlocking the car by the remote, which arms the alarm and flashes the hazards a few times when doing so.

I am assuming as it is temperamental that it is probably a loose connection somewhere, possibly linked to the alarm, however I have no idea where to look or really what I am looking for. Any ideas?

Cheers