Just bought a private number plate?

Stop.

Simply paying for it, and having that confirmed does NOT mean you can put the number plates on your car and start driving around.

Buying the private number plate is the first step. But, until it's been transferred to your vehicle, you cannot use it.

Selling number plates is unlike selling anything else. Each registration number is unique, and means something different to each individual. As a first option, most will choose a number plate with their name (if budget allows) or, alternatively, their initials. Others will opt for a number plate that reflects a hobby (like horses or a music number plate), or their job (such as doctor or pub). The most common (and affordable) are initials. Some initials are more common than others.