A Class 4 MOT is the most common type of test and here is a list of which vehicles need to get a Class 4 MOT:
Cars that carry up to eight passengers
Motor caravans
Three-wheeled vehicles that weigh more than 450 kg
Quads that are a maximum of 400 kg of unladen weight
Goods carrying quads with a weight limit of 500 kg and maximum net power of 15 kw
Dual purpose vehicles
Private hire and public service vehicles with up to eight seats
Ambulances, taxis and private passenger vehicles