This is going to be a farce!
I've just ordered a couple of new 'booster seats' at least I thought they are booster seats but apparently they are booster cushions!
This is what I (and every online shop I've looked at) class as a booster seat;
When in fact this is a Booster seat, the pic above is a booster cushion;
To confuse things still further, the bosster 'cushion' is suitable from 15kg, whereas the law now states booter cushions as being for children 22kg- 36kg