Part III FOUR WHEEL MOTOR VEHICLES
A motor vehicle which–
(a)
has at least four wheels;
(b)
has an unladen mass exceeding 400 kg or an engine with a net power exceeding 15 kW;
(c)
is used for the carriage of passengers; and
(d)
is constructed to include living accommodation containing at least the following equipment:–
(i)
seats and table;
(ii)
sleeping accommodation which may be converted from the seats;
(iii)
cooking facilities; and
(iv)
storage facilities,
all of which equipment is rigidly fixed to the living compartment notwithstanding that the table may be designed to be easily removable.