Also used by the BAAC at LHR
In the 70's we at the British Airports Authority Constabulary had one in white Police livery. The back door had been in-filled with concrete as it towed a large steel / concrete trailer and was used to attend bomb threats/ and the suspect items were placed inside the trailer, I never drove it but had a lift in it and it was so heavy it could barely reach 30mph.
Slightly off subject but aviation connection.