I'm also a believer that motorway driving should be covered. I learnt to drive in Plymouth which has no direct access to an M-road at all. Nearest is the M5 junction at Exeter for us down here. We have a road called the 'Devon Express Way (A38)' which connects various areas to the M5. The road is a major A road dual-carriageway and has between 2 and 3 lanes in each direction depending on your location on the road. It has a fixed 70mph limit almost the entire length (250+ miles I think). However, the majority of traffic on this road near Plymouth City is freight and industrial leaving the city heading to the outskirts of Plymouth. Therefore it is rare when in and around Plymouth that you will see a steady traffic flow at anything above 45 mph on this section. There is a lot of lane changing as exits are very frequent and have little to no slip-way run-in/out either.
I never set foot on this road with my driving instructor at all, despite the fact it is not a 'Motorway'. I had used several 60mph zones that we have locally, but never anything more. Personally I think they need to teach some lane discipline, regardless of the road your on, which seems to lack in some people these days! It's rare I do more than a few hundred miles on the motorway in a year but even the short journeys I have done, the most common occurrence is middle lane hogging.