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[maddp]

Thanks Kevin. Possibly time to give up on this one. Once warmed up this morning I gave the throttle a serious yank (as per Jimbob's advice at the start of this thread) and the rear actuator twitched. I wasn't monitoring the front one but have trapped a small piece of paper in the end stop that will release when I really open it up which I have no intention of doing in the current conditions ... even with five sacks of ballast in the boot.
My conclusion is that the EM is pretty clever and it is only activating the valves when both the revs are as described in the documents and the engine is under load - detected from a intake manifild pressure sensor(??).
Thanks to all for the advice along the way.