Andy has just left mine, with the fault repaired.
I have no idea who the garage that had previously looked at it are, but I certainly wouldn't use them.. Will let Andy explain that bit.
Anyway, quick actuations check of all the LCM outputs and yes, no inner os flasher. Codes stored in LCM pointed to an open circuit in the flasher.
Up on the lift and accesses the back of the lamp, much easier than on the floor!
Back probed the feeds with power probe and still nothing. Disconnected headlight from the car and applied power directly with the probe, still nothing, so it's the headlight and not the LCM..
Pulled a spare indicatior bulb and holder from a headlight I had, was starting to remove the one from Andy's car when I realised it was loose... Half a turn clockwise, and voila, code's cleared and data streams monitored, all good.
Some garage... New LCM my @rse...
Mike