Worst one I ever had was at Snippersgate garage in Houton le spring
http://www.snippersgate.co.uk/11530/index.htm
Right bunch of "dell-boys", they wouldn't let me test drive a 350 Until I had paid them a non refundable deposit of 1/4 of the cars sale price.....
Thus, basically making you buy the car even before you had test driven it.
For their "flash" website, the actual dealership is an absolute hole, rundown building etc.
I walked, needles to say....