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For quite a while , three letters , preceded or followed by up to three numbers was quite normal , and in the fifties they brought out the format of two letters preceded or followed by up to four numbers . The implementation of these formats varied from one local authority to another ; and there could be different groups of numbers allocated to private cars and commercial vehicles ; plus authorities such as the forces also had ( and still have ) their own numbers .
all true - but nothing to with age of vehicle or time of registration....only type of vehicle and place of registration...