The UK Rules of the Air Regulations 2007 Rule 42 refers to right of way on the ground
Paragraph 2: ‘Notwithstanding any airtraffic control clearance it shall remain the duty of the commander of a flying machine to take all possible measures to ensure that his flying machine does not collide with any other aircraft or vehicle.’
Paragraph 4 then states:
'Vehicles and flying machines which are not taking off or landing shall give way to vehicles towing aircraft.’