Brits may be missing out on an average of £1,600 by not checking the value of their car before they put it up for sale.   According to new research, 45% are unhappy about the amount of money we get for our vehicles, with a quarter saying they’ve lost out because they didn’t know its true value. The root of the problem, according to the study commissioned by Autotrader, is that 44% of British drivers don’t know what their car is worth or how to check it. (51%).  Experts at the automotive marketplace say that this means the average person could miss out on £1,600 – a month’s salary after tax for many. Erin Baker, editorial director at Autotrader, said: “So many people worry they’re not getting the best deal when they sell their car, and the research shows that fear is justified.” The survey suggests that a major issue is misconceptions around car sales and valuations. Almost a third (29%) of those polled think that getting a car valued takes several hours rather than a …