'Q' registration numbers
DVLA issues ‘Q’ registration numbers to vehicles whose age or identity is in doubt.
If this happens, any original vehicle registration number will become invalid and you mustn’t display it again.
To get a ‘Q’ registration number, your vehicle has to pass a type approval process.
Step 1 Check the vehicle before you buy it
You'll need the vehicle's registration number, make, model and MOT test number. You also need to see the V5C vehicle registration certificate (log book).
Step 2 Buy and register the vehicle
Step 3 Insure the vehicle
You must have insurance before you can use your vehicle on the road.
Step 4 Tax the vehicle
You need to tax the vehicle before you can use it on the road.