i think mine do (hanley, stoke on trent) as when i called last week he asked me if i was trade.
When i went to the newcastle under lyme vauxhall they were a heck of a lot more friendly. Didnt mention prices so dont know if their friendliness would have extended to better prices 
Matt
Theres 3 different prices......confusing a bit i know.....but heres how it works
Full Retail Price......you pay over the odds
Trade Price......some discount for items not in TC book and for all items if you havent a TC card and you are cheeky and ask for trade price.
TC Price......better than trade price for all items in TC book and you have a TC card
Its only 'popular' service items that are in the TC book......but items do get added now and then.
An example.....
Centre section exhaust for 2.2 saloon is in TC book and you save about £50 on FRP with TC
The same item for an estate isnt in TC book......so if my dealer takes pity on me i will get about £20 off the FRP......thats the trade price.