You can apply to retain the vehicle registration number (VRN) of your vehicle before it is transferred or deregistered, or after you have deregistered it. You can use the retained VRN on a new vehicle that you intend to register or an existing vehicle that you currently own.
However, there would be a fee, however, it would depend on whether you use it on a new or existing vehicle.
After you have retained your VRN, you have up to 12 months to use it. You can pay a fee to further extend its validity.