Hmm, just joined the dual carriageway and was increasing speed when......engine cut out , locking rear wheel and inducing some weave.....there was more than one skid mark I can tell you......
No damage to either me or the bike, kept upright and pulled over to the side of the road. At first I thought that the chain had snapped but I guess that it was just one of those things.
After it happned the bike took to cutting out as well when it got hot, don't know if it was coincidence or not but it's now sorted after undertaking a raft of Frankenstein experiments to try and isolate the cause. (including bypassing the Lambda and stepper motors)