I had this issue on cylinder 4 too, turned out to be a lose wire coming out of the ecu, Cant remember exactly what pin number it was now though, but...
I'd just like to point out that when i started doing these days i was a novice, i'd done a day at silverstone where i sucked balls at drifting, a day...
Whine whine whine, The bdc hire the circuit, lydden dont run that event so setup marshalling etc isn't down to them. I had less seat time at the bdc...