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I've had similar, also on a Harrop. A few months ago I got stuck in limp mode as well, very annoying since there was no code until then. We noticed a voltage change when jiggling the jumper harness to the throttle but pulling the harness and doing a continuity check revealed no issues and we couldn't repeat the finding after we'd reassembled either. Tried cleaning the throttle body and MAF, no change.
We ended up swapping one of the relays and that seems to have resolved everything but I don't drive the car very often to be definitive. This was the same day as trying some of the other fixes. Just turned off the car, swapped a relay and when it turned back on the problem was gone.
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