Category D1
You can drive vehicles with:
No more than 16 passenger seats
A maximum length of 8 metres
A trailer up to 750kg
Category D1+E
You can drive D1 category vehicles with a trailer over 750kg, but the trailer when fully loaded can’t weigh more than the vehicle. The combined weight of both can’t exceed 12,000kg.
Category D
You can drive any bus with more than 8 passenger seats (with a trailer up to 750kg).
Category D+E
You can drive D category vehicles with a trailer over 750kg.