I think that it is just possible that you may be missing the point of the Government's scrappage scheme;
it is to support the motor trade by encouraging people who might otherwise hang onto serviceable but essentially unreliable and unsafe cars to scrap them and buy a new car.
As to the market value, I very much doubt that many people scrap cars where the true open market value is more than £1,000, let alone £2,000
If your car is over ten years old, is perfectly reliable and you are happy with the lack of safety features, then hang onto it. If it is a wreck but for some reason worth an absolute fortune, flog it privately and get one of the massive discounts that are alleged to be available on a new or pre-registered cars
Too damned right there
Perhaps these entirely rational, unsentimental people scarp their old, unsafe, unreliable, expensive to maintain car in order to reduce the running costs and to get a safer, more reliable car
Sorry, I don't speak Welsh, I can't help you