I might be wrong here but i think malc meant that;
they are not traders in the sense that someone is trading from home or without a forecourt where they may not have the best interests of the customer at heart and would only be interested in taking your money and you wont have any comeback or any sort of customer service.
He meant that these guys are well established, have a forecourt and you can expect them to still be there 6 months down the line.