Hi, when I use the left indicator, the light on the dash blinks at high speed, while the lights hemselves on the front and rear of the car,  and on the left mirror operate at normal speed. The fault light on the dash also illuminates, showing a bulb with a red cross on it. This is an intermittent problem, and resets when the ignition is turned off and then on.

The right indicator operates just fine.

Any ideas on a possible cause? Thanks.

Hello Denzil,

Possibly a substandard earth connection, leading to a high contact resistance. Check earth onto the offending light. 

Following on from Gareth's sound advice you could also get a diagnostic check to see if any fault codes flag up as it could be an issue with the light switch or indicator stalk. 

15 hours ago, Steve Q said:

Following on from Gareth's sound advice you could also get a diagnostic check to see if any fault codes flag up as it could be an issue with the light switch or indicator stalk. 

Ran a scan using OBDEleven and this popped up:

 01134 - Alarm horn No signal/communication
            static
        03192 - Left rear turn signal bulb 2 Electrical error in circuit
            Intermittent

Looks like it needs to be seen by an auto electrician 

If it's the same as mine, take the inner rear indicator out and put on a radiator for at least a few hours.

Then put some sealant around the seal (I just used silicone grease) and reinstall.

I've just caught my left one early and (hopefully) fixed it this way.

My right, I left too long and had to buy a new (genuine)one. 

The left had no condensation, the right, did.