Well there has been an unexpected twist to this saga! I forwarded the code extract to the garage you kindly provided and they sent a email reply saying had booked the VAG Auto electrician. I then received an email over the weekend saying all fixed and car ready for collection today (exactly 4 weeks after I first took it in for an MOT!) The bill came to £467 which included the MOT, removing, and sending off ABS pump to another company for testing (and finding not faulty despite error codes suggesting otherwise and I did see the errors), fitting a new brake master cylinder and replacing a plastic pipe on cylinder head for a coolant leak.
On collection this afternoon, I asked garage where they going to keep the code for future reference. The reply was "Well, the auto electrician never turned up, so we tried the code you forwarded on and it worked"! As well as my sincere thanks you should give yourself a well deserved pat on the back!
I've owned this car since 2013 and had just one owner before me, so very pleased and happy it's back on the road.