Went to change the main beam bulb in the Passanger lense when I looked at it I thought it was not blown. I put the new one in and no difrence so just to make sure I switched the working driveres side bulb and it did not work. So I guess its a problem with the lense not a fuse as the driveres side is still working. Any idea how I unplug the lead from the back of the lense?

I don't have an Octy 2 manual to hand, but it's not that uncommon for cars to have separate fuses for each headlight (bulb or element as applicable to model).

 

Other than that' I'd suspect a broken wire or connection on that sub-circuit.

The left main headlight shares a fuse with the left rear light.

Turns out it was a dirty contact all sorted. May thanks for your help