What does “51 Reg plate”mean ?
When they ask if it is a 51 reg plate they mean does it look like this: CA51 SIE If it does then it is a 51 reg, all it means is it was registered after/during September 2001. Like, a 57 reg car, CA57 SIE was registered this September, or after. It gives the potential buyer the chance to look up specifications on that model car, find out pros/cons and what the average mileage/price etc is.