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Re my occasional misfire only under load:
JKM, who experienced the misfire under load on the dyno on Saturday, tell me I should be fine to drive the 90 miles to them if I continue to take it steady. I have to pass by JKM on Wednesday anyway and I have VW Assist/RAC full cover and a spare coilover in my boot if it gets worse en route.
I have a recording session tomorrow and so doubt my window of free time would coincide with Dave also having a window. Plus I am low on V-Power and would have to travel an extra 30 miles to get some before visiting him whereas the nearest Shell station is on my route on Wednesday.
So thanks for the helpful info, Nath, but I think Wednesday and JKM is my best option.