Help for Parents. 
On my website I have a page explaining  that if a parent is giving extra tuition I will help them at no extra cost, all I ask is that they phone me in the evening after I've finished teaching.
Some do and their son/daughter fly through lessons because they are teaching the same as I do, others know better.
You always indicate when you stop on the left, you always indicate if you're passing a parked car. On approach to a  mini roundabout you don't have to stop just drive right across, on approach to a normal roundabout you must always stop even if it's clear.
One father about my age argued that his instructor many years ago taught him to release the steering wheel after turning as the car would right itself.
There is also some confusion as to the difference between solid white road marking and broken white road marking.
Could go on for ever.