You can take a speed awareness course every three years. Jeez, you make everything sound so dramatic. Two tickets in 11 years is no big deal. If you think an A road is the same as a motorway, that might be an indicator of the breadth of the problem
When you drive to London from France, have you ever used the M2? Have you ever noted how that just rolls into the A2, but is still 3 or 4 lanes wide and still the same speed limit? Or have you never noticed that the motorway has ended and turned into an A road because it all looks the same, apart from the colour of the road signs, if you noticed them? There are always learner drivers on these type of A roads, not just the A2, and they turn off the A road before it turns into an M road.
The other day we were on a road and I didn't know the speed limit! Sorry, maybe I'm just thick but that's what signs are for! Just put up a few signs with the numbers on them.
How could you not know what the speed limit was?
It's the same for every type of road, according to what you are driving, unless the local council, or Highways England or the motorway, has speed reductions and then they are signed. e.g. parts of London are always 20mph and they are signed to let drivers know that it is not a 30.