What’s the difference between B and B1 on licence?

What’s the difference between B and B1 on licence?

For example, when you pass your car test – a category B will appear on your driving licence. A B1 driving licence category would be motor vehicles not exceeding 550kg and a C1 category driving licence (large goods vehicle) allows you to drive vehicles weighing between 3,500 and 7,500kg.

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