RX prefixed cars

[Dashnine]

There seem to be a lot of RX prefix cars around, is there a reason for so many registered in Reading?

You see a lot of ex-management and press JLR cars around with O for Oxford (Engineering cars tend to be V plates though), BMW and Minis press and TV loan cars with Y for Yorkshire as their fleets are registered there, is the a similar reason for MGR?

ETA: Oops, wrong forum, I didn’t really mean V8s specifically- Mods move the thread if you can, I can’t see how to.