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UK number plates must be fixed vertically, be easily readable in daylight and have the rear plate lit at night. Here's what the law says about positioning.

Bevelled (4D retro) number plates are road legal in the UK if the raised characters are solid black, in the standard font and spacing, with BS AU 145e marking.

Number plates have no legal expiry date. What decides how long they last, what old plates look like, when to replace them and what our 3-year warranty covers.

Hex number plates are road legal in the UK if the characters, spacing, margins and markings meet the normal rules. Here's what the law says about plate shape.

Which flags and national identifiers are allowed on UK number plates, where they go, what changed with GB and the EU flag, and when you need a UK sticker abroad.

In the UK a trailer must show the towing car's registration on a standard rear plate. Trailers over 750kg towed into most of Europe also need a DVLA trailer registration number and plate.

Green flash number plates are only for zero-emission vehicles. Who qualifies, why hybrids don't, where the flash goes, and the plate styles you can have it on.

Road-legal number plates cost from around £20 to £80 depending on style. Our prices, the extra costs to know about, what most people buy and why some plates are so cheap.

3D gel and 4D gel number plates are road legal in the UK if they meet BS AU 145e. Here's what the rules say, what makes a gel plate illegal, and how long gel plates last.

The standard UK number plate is 520mm × 111mm, but there is no fixed legal plate size. Here are the common sizes, how short a plate can legally be, and how to measure your recess.