Royal Air Force radar/radio (ground) has a quite complicated naming system:
First there is AMES - Air Ministry Experimental Station
Each type of radar has an AMES number
Each radar station or mobile unit has its own AMES number based on the type number
For example - Oboe as a system was known as AMES 9400
Mobile Oboe units/trains were AMES 9441; AMES 9442 Etc.
Then each vehicle had a RVT number - even GS lorries (tenders to the RAF) if they were attached to a radar/radio unit - I suspect that the RVT number sometimes related to the specific type of unit it was attached to so the same vehicle/equipment combination may have more than one RVT number.[I know of 2 RVT numbers relating to a 20KVa generator on Austin K6]
At least that is my current understanding
If anyone knows otherwise please correct me.
Cheers
Noel