After a bit of research my code reader will only see engine faults. Need something like an Autel or budget alternative to see the other codes with all the other ECU’s and CANBUS. long term it’d be a good purchase but can’t source new in time for the MOT from AliExpress.

Fingers crossed it stays off for the MOT. Don't know if you managed to remove the terminals, if not here's a link that you may find uselful: -

https://www.rrsport.co.uk/gallery/albums/u...RATION.pdf

It's from the L405, but still spplicable

Cheers checked out of a lot of YouTube on de-pinning. I’m going for that and the white vinegar with one of the kids fine paintbrushes (then hairdryer). It’s not on at the start of a journey comng on after a few minutes suggesting to my mind a moody connection

Certainly worth a try, ideally you need a code, but worth a try none the less, perhaps try a bit of the Mrs nail varnish remover in case there is any oxidation on the contacts, shouldn't be as they are gold plated, but won't do any harm.