I don't believe there are now any card only supermarkets anywhere in the U.K., of the major groups anyway. Sainsbury's opened the first card only supermarket in Holborn, on the edge of the City of London, a few years ago and coincidentally(?) the firm had a series on the BBC at the time following their operations. It was not just card only, every item removed by a customer from the shelf and put into their basket was observed by a mountain of cameras and tallied up ready for the 'check-out.' The store was deliberately chosen as being optimal for the (initial three month) experiment. It was clear from what was shown that, from the start, this wasn't going to work, with many office workers just wanting to grab a banana and go, and it all taking far too long. After a short while, an unadvertised till at Customer Services had to be re-opened taking cash and doing scanning, with a queue of up to twenty people at times. What Sainsbury's had thought was going to be a free P.R. exercise for the firm, following the uncritical one on Iceland which preceded it, showed them with egg on their faces. The M.D. had to admit the experiment had not been a success, was removed from the branch and would not be 'rolled out' elsewhere as they originally planned.