Depends what you mean by a full uk licence? You have all categories A,B,C,D
If you have a car licence you can drive a car
If you have a bike licence you can ride a bike/scooter
I see a few saying you don’t need an IDP but I’ve been stopped in the passed and the BIB wanted to see my idp only and didn’t care about my uk licence so its all comes down to what the officer believes is the law, for £5.50 why not get one