What it means is anything which applies to a driver also applies to a driver whilst instructing.

So no drink or drugs, you can be tested if the car is stopped, no using your mobile phone while instructing, you can get the points and penalty.

If the driver is dangerous, speeding etc it is down to you to intervene.

No motorways (be aware that not all motorways look like motorways, so know where yours are). A friend was pulled for taking a learner on the Leeds Inner Ring Road, its only a 40 limit, but its actually the A58(M) and is a motorway in order to exclude certain vehicles.

You do not need any insurance in your name, you do not need to inform your insurer should there be an accident while she is driving.

As advised get at least one extra mirror for the passenger side so you can see what is behind and alongside at all times.

Learner insurance is generally much cheaper than newly qualified driver insurance so check prices before choosing a car.