Trade plates
Trade licences are issued to motor traders and vehicle testers, and permit the use of untaxed vehicles on the public highway with certain restrictions. Associated with trade licences are “trade plates” which identify the holder of the trade license rather than the vehicle they are displayed on, and can be attached temporarily to vehicles in their possession.
Until 1970, two types of trade plate were used. General trade plates had white letters and numbers on a red background and could be used for all such purposes. Limited trade plates used red numbers and letters on a white background and were restricted in their use (e.g. a vehicle being driven under limited trade plates was not allowed to carry passengers). From 1970 onwards only one type of trade plate was used, which perpetuated the red on white format. The format of trade plate numbers comprises three digits followed by one to three letters.
more information at www.regplates.com

Jon Cherry is a Director of leading personalised number plate dealer Regplates.com. Jon has over 25 years industry experience handling some of the most expensive plates ever sold with many high profile and celebrity clients. Active since 1991 in the number plate industry, Jon is currently Chairman of the Cherished Numbers Guild, a trade body representing number plate dealers in the UK. Jon has written many articles on the industry and insight into the future of numberplates and the market as a whole.