Conversation so far:
what is a registration mark on a car
Vehicle registration marks are used to identify vehicles and their registered owners.
where is the registration mark on a car
Vehicle registration plates are the mandatory alphanumeric plates used to display the registration mark of a vehicle, and have existed in the United Kingdom since 1904.
what do the first two letters mean on a uk vehicle registration plate
The first two letters of your UK vehicle registration plate represent where it was registered. The first letter is for the region and second for the local DVLA office.

Question: what do the two numbers mean
Self-contained rewrite: what do the two numbers mean on a uk vehicle registration plate