You need the right licence to drive a motorhome or campervan, and your vehicle needs to be within UK size limits.
The licence you need to drive a motorhome depends on your age and the vehicle’s maximum authorised mass (MAM). This is the vehicle’s weight plus the maximum load it can carry.
To drive a motorhome with a MAM of between 3.5 and 7.5 tonnes, you need a category C1 licence.
To drive a motorhome with a MAM of over 7.5 tonnes, you need a category C licence
More information at https://www.gov.uk/driving-motorhome