Hi all, I finally “fixed” this one despite not really doing any one specific thing. Yesterday I took out the under bonnet fuse box completely, removed all fuses, then put it back. I also removed the BSI unit behind the glove compartment completely, connectors off, fuses out. Let’s call it desperate measures. I then put it back, reconnected all. Presto - window inched up and now works fine. I can only assume it was either the full disconnection of the BSI which has reset it despite numerous by the book BSI resets having been done, or a poor/loose connection somewhere sorted in either the BSI or fuse box. I pass this on in case helps anyone else. Cheers!