Thanks Fred, yes have OBD11, need to blow the dust off it as haven't used it for ages.
But I have Side Assist fitted, as I have the LED's in the wing mirrors, and it warns me of approaching traffic, so as they go through those elements I'm assuming all is present and correct.
Took a screenshot of the YouTube video I saw, it's in German but using any Translate tool, it appears that "Assisted Lane Change" is an option to turn on. I've seen a second video that only had that one option, the Steering Resistance option was not there. So it must all come down to what Driver Assistance options each car has.
I had Park assist on my previous car, and there was obviously a motor for the steering wheel, as it would spin when parking itself, and also there was a forceful resistance for keeping the car within the lane when driving, which to be honest I don't feel with the Golf. So maybe extra hardware (i.e steering wheel motor) is needed for this feature, or possibly the extra side sensors which you get with Park Assist?
As you said this feature has only come about on the later revision Golf's, and supply of them have been sporadic, and also how many people use the features that are available with the car, it's only because I like gadgets & tech that I wanted to see it in action. I have raised the question with VW Customer Services to see if they can give an answer, I would hope at the very least they can look at my VIN and tell me if the feature is available/fitted or not. I'm also going to the dealership next week, so could try asking the guys there, although my experience is that they may be good mechanics, but may not necessarily know about technology, which is what you need with all the modern features coming with cars now.