I should update my initial list, but at that time I was only looking at available kits.
There were many different types of ambulance employed and I believe very few Austin K2's as most were left on the beaches at D Day. So, they came in different sizes.
30cwt
Albion 463 n- 4x2
Austin K2 - 4x2
Fordson Thames Sussex - 6x4
Humber
Morris Y type
Some Tillys were converted
Bedford ML
Morris Commercial.