I did pass plus which was invaluable.
I was told when overtaking, to pull back in when I can see the overtaken vehicle appearing in my rear view mirror. That means you've given it sufficient stopping distance.
The number of times I'm about to final check and indicate to pull in and there's someone in their BMW/ Audi/ Merc slicing in to the gap on the left and undertaking, but it's inevitably the type of driver who doesn't need stopping distances and relies on an invisible forcefield and telepathy (to make up for the lack of indicators) for their safety. It is very rarely I encounter other makes doing it which makes me think that I'm not wrong for having listened to my instructor, and the issue is their impatience.
Weavers drive me round the bend. Especially the type that think the stopping distance at 85mph is 20cm. They make the Harry Potter Knight Bus seem like tame driving.
The nearest motorway to me is 4 lanes. We therefore get the delight of the Lane 3 Hogger. So you're driving along happily at 70mph in an empty lane 1, and technically you should move across the empty lane 2, nearly empty lane 3 and into the empty lane 4 to overtake before moving all the way back to lane 1.
I'm sure a lot of people have a phobia of lane 1!
I hope that introducing motorway lessons before the test will cause a long term improvement in motorway driving... although the numbers of people on "smart motorways" that have never read the highway code or applied logic to understand that X is a closed lane is a slightly terrifying concept...