By the look & age of ECU it’s probably a Mk1 f & I didn’t recognise the connector, unless it’s the angle from which the photograph was taken, it doesn’t fit comfortably into the family of connectors used on the car.
Even early looms came prepared for facilities not seen on all marks, it could be a refugee from an air conditioning system. That would make sense as not all air con units followed MGR connector conventions.
I’d be interested to know, I can see a bit of research poking it’s nose into my pre Christmas dash to get up to date.
M

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