I know of a number of people that are still trying to sell cars after bringing their new car in from the UK.
There is no definite answer as to whether your own car will sell-you haven't even posted make, model, fuel, age, mileage............even then, all you will get is opinions. There is a 'what is my car worth' thread on Boards that might be worth posting in to see what people say.
Why take the risk unless you can afford to-put your own car up for sale and if you sell it, go to the UK and buy.
Very liitle is selling at the moment.