I set the wheels in motion this morning. So far, all very smiley and understanding (much "I see where you're coming from" and grave nodding of heads going on), but no cash forthcoming yet (as expected). The dealer wants me to involve BMW UK, which I have done. Although the relevant legislation concerns the retailer not the manufacturer and both I and the BMW UK representative agreed with each other on that.
I am also on hold to BMW Financial Services, who technically own the vehicle.
Clearly not fixed the problem then.
I suppose you could let them try and fix the problem for a third time......but.....perhaps not.
I could, however last night's incident happened about 700 yards after I got off the M42. The prospect of sitting in the dark, stationary in the outside lane of the motorway without even my hazard lights on to warn oncoming traffic really does not bear thinking about.