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The problem proved to be the 250A engine start (CUBE) fuse.
This does not look like a fuse, its located on the battery terminal.
I had to drive to Oxford (a company called 12v Planet) to get one and it cost £4.99.
My switching the ignition key off whilst the engine was running is the only reason I can guess why this fuse blew. I only hope this the case.
Thank Goodness; Mine blew in a French lock earlier this year. No hint why the engine would not start or what to do about it. Simon Piper talked me through finding the fuse, which I bypassed to get me going.
I'm relieved to find I'm not the only victim of this problem; even more relieved to hear a possible cause (I do not remember turning key before hitting the stop button).