[Indicator issues]

I have a defender 90 2011, the near side front indicator does not work. 

All other indicators work and due to the front n/s not working, all other nearside indicators flash faster than usual which is what i expect.

I have replaced the bulb, the indicator unit and I am still getting no light. I have checked the voltage across the wires and the multi meter indicates maximum 0.5V. 

I thought about replacing the relay but if the other lights are flashing then surely there isnt a fault with the relay? is this true?

Next thought is to check the ground but I'm unsure where to locate this.

Can someone give some advise on this issue before i take it to the garage

Thanks