Final update from me ... local Skoda specialist couldn't book me in until Jan 7th at the earliest, so I was recommended another local, independent VAG specialists around 10 miles away from me.
I sent him a text, testing the water so to speak, and he replied with a few suggestions (driving in a straight line for 100 yards, turning the steering wheel on full lock either way and holding it) to see if that would clear the dashboard lights ... which it didn't (think we already knew it wouldn't) ..
To my surprise he then offered to call around that night at my home address to check with his scanner. He turned up on time, plugged in his SnapOn scanner and said (as was advised by @nta16and others) that the rear left ABS sensor was not communicating. He then offered to collect my car, and drive it (in limp mode) to his workshop 10 miles away a few days later.
Fast forward a few days, and the car was collected as promised. Followed by an update within 90 minutes advising that the ABS Sensor need replacing, along with the wheel bearing (as the magnetic pickup ring ?) was also damaged. He also recommended the rear pads were replaced as they were down to 1mm.
I told him to go ahead and do the work, which he did the same day. Car was returned to me that same evening with all light extinguished, limp mode gone (hooray) and a detailed invoice of parts used ... all of which were charged to me at what I would call very reasonable prices (£26 for the ABS Sensor, £20 for the rear pads, and £69 for the wheel bearing) plus 2 hours labour @ £45 per hour.
The parts were equal to what I would pay with discount at Euro Car Parts, so I was more than happy.
Car now drives like a dream too He also made me aware of a fault code that was present on his SnapOn reader (but interestingly not present on either Carista or the XTool) that he said Skoda/VW were aware of but couldn't provide an explanation for, so not to worry about it. He offered to send me the tech bulletin if I was concerned, but I'm not.
Talking to my new found workshop mate, he was a master mechanic for a couple of local Dealerships, but then decided to go it alone a couple of years ago, and is now building up a healthy business based on recommendations alone. I know where his workshop / garage is ... and will be taking my Yeti there again if needed.
Oh, and he was also full of praise for the 2ltr Diesel Yeti (110bhp) model saying the only things that really ever go wrong with them are ABS sensors and Squib rings. Fingers crossed he's right
Thanks for all the comments and advise lately folks ... really appreciate it !