Many thanks to both of you.
Having changed plenty of pieces, it seems that it was all down to the fuel/LDA pin. It still had the collar welded on very well, with tamper paint etc - so definitely had never been touched. Instantly resolved the power issue. I am at a loss as to whether it was misconfigured for the last 275k, or perhaps had a misconfigured renovated pump, but it is sorted at least! Thanks for all of the help and suggestions.
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