Here in the US there are web sites that can provide one with a value for a used car/trade in. kbb.com and nada.com are two that come to mind.
There should be something similar in the UK. 'course, you'll have to use a proper search to find these links applicable to the UK car market.
You can also search for used examples -- again being sure the search is for UK cars only -- that are similar to your car and see what at least the asking price is.
There should be something similar in the UK. 'course, you'll have to use a proper search to find these links applicable to the UK car market.
You can also search for used examples -- again being sure the search is for UK cars only -- that are similar to your car and see what at least the asking price is.