No Conor, happened on Monday for some reason - can't really blame Pete, though full throttle rotation was noted several times while he disappeared into the distance. Yesterday, I "reefed" on the linkages from the LH side to see if that would change anything. It did - now it was trying to idle at 500 rpm. Reefed it back the other way and all is good again.
I suspect something with the linkages and/or the stepper motor are not quite healthy - maybe a hose is resting on the linkage rod. Need to pull the tank, airbox and associated bits and bobs to get at it. Weekend job No 3754!