L-Plates are a legal requirement if you are driving a car as a provisional licence holder. There are many cheap ones on Amazon but beware: some of them don’t meet the legal specifications of size and colour. If you want to buy a set of L-Plates that are legal and exceedingly good quality, then click here.
There are times when L-plates might also be used, even when the driver isn’t a learner: If someone is training to be a driving instructor then during role-play sessions, L-plates must also be used. Additionally, if you passed in an automatic car and then learn to drive a manual car, you’ll need L-plates again (but don’t worry: you don’t have to redo your theory test).