So I have been out and about in the car for about 60 mi today. It no longer feels like a hyperactive squirrel darting about all over the place when LKA is active. It still doesn't deal brilliantly with low sun early in the morning directly into the camera which can still cause confusion with Lane. Keep assist.
But it does feel much better and much more usable, it's less twitchy, it doesn't seem to grab the wheel in such an abrupt manner , there are far less false positives and I mean a lot less, from the system misreading the road.
There's also a noticeable improvement when using the Lane keeper system in conjunction with the ACC whe n it is set to traffic jam assist. Previously, over the first 47,000 miles I've driven in this car whenever I've tried using TGA, the cars felt very erratic and quite honestly somewhat unnerving.
I've tried it today on a combination of dual carriageways and rural roads and been very pleasantly surprised at how usable and trustworthy the system seems after the update.
Overall, positive news.
I still have some concerns over the car noticing white hgvs against the sky when ACC is working as it does seem to see them a little bit later than other vehicles but that's a conversation for another day...