Gareth, Steve... thanks. I should point out, I know NOTHING.🙂
I'm reasonably competent wit I.T., but I don't know anything about what cables/devices are needed to connect, or what software or websites I should be looking at. Is OBD11 a RossTech product? I did a quick search for VCDS/OBD11 and got loads of hits for devices/software ranging from £15 to £500...??? ...Amazon, eBay ... and some stuff that requires "credits" to cary out certain operations... to me, it's just a minefield.
I spent a couple of hours at my independent (the one who replaced the car battery). The mechanic tried recoding the battery several times with no success. He didn't seem to have any clue about how to fix the specific problem. The gadget he was using showed a fault on the left-rear door handle touch sensor. His final decision was that this fault might be preventing keyless from working. The suggestion then being that I fork out £98 + VAT + Labour for the sensor replacement, not being totally sure that this would fix the keyless access problem.
If you've the patience, a little more detailed help would be appreciated. Thanks again.