Update.
I took the car for a drive to warm it up and when I parked it back in the garage, I disconnected the wire from the back of the alternator, but left the battery connected.
The next morning I released the radiator cap and there was a bit of pressure (also a bit of gurgling back into the overflow bottle), but not as much pressure as in the past.
I checked the wiring around the alternator and the nearby temp sender unit (for the electric fans) and can't see any wiring touching anywhere.
My next step is to take it for another drive over the weekend (how I hate that, LOL), and then disconnect the temp sender wiring and see if there is any pressure build-up or retention.
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