wrote:

The real cause of you getting a shock would appear to be that the
earthing on the microwave had failed. If its case had been correctly
connected to the wiring earth you wouldn't have got a shock regardless
of the state of the neutral connection. I don't really understand how
your 'fractured neutral' caused the microwave to be live.

No, nor me, unless it was touching the earth.... ?
As for the 120v (measured potential between sink and Microwave case, I
just assumed it was a half wave (?) of the 240v

Either way, both have been replaced and the bonding hs been run to the
taps/sink.

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