Quick update...I had a quick look for the receiver box you mentioned...I found it...hiding up there in that really awkward position
and eventually managed to pop it out...pressed the button on my key and it lit up...and the van locked!!
Dude, that hasn’t happened for months!! Either your some sort of telepathic ford keyfob god or maybe all the wiggling of the wires got it working again? I don’t know but either way it’s definitely a step in the right direction...
I’m guessing then, that now I know my key is not completely f*** (and must be semi programmed- enough to at least do the locks) then it should be ok for the immobiliser to recognise it? I’ve not given it a whirl yet...I shall post again tomorrow...cheers Loot!!