You should make it AV 88888, 8 x5 being 40
In the UK they are white at the front and yellow at the rear. This is to help drivers on dark nights identify if the car in front is facing them or not.
(In Germany they are white at both ends of the car and in the Netherlands they are both yellow)
Nice design in the UK.
In China, cars shorter than 5m have blue plates. So most cars have blue plates, except a few luxury cars, like Maybach, which are longer than 5m.
vehicles longer than 5m have yellow plates. So buses, trucks have yellow plates.
These explanations are not exactly precise, but generally true.