2nd hand car showrooms

[Pugwash]

Can anyone recommend a good 2nd hand car showroom?  I do not think my car will pass its MOT next month so am on the look out for another car. Family have used Lancers in Beckenham for their last 3 cars, but they only have 1 automatic drive (Nissan Duke) which is too big for me. Would like Ford/Vauxhall etc or similar size. Must be automatic, petrol and ULZ compatible. At this stage just want to get an idea of what is out there and prices. Hopefully my car which is 20 years old, passes MOT this time which will give me longer time to look around.