Thank you, Roger. Good to have confirmation that I'm not losing the plot! I think what you thought you had remembered is a better arrangement but leaves the fan running with the ignition off unless the relay coil has a separate switched live feed.

410 Aircon compressor mount
 

I am at last making some progress with installation of aircon on my 410. Pictures of compressor pump bracket attached.https://www.bristolcars.info/forums/...1&d=1733580767