Two supermarket chains (Tesco and ASDA) control half of the market. The next 5 in order of size are : Sainsburys, Morrisons , Waitrose, The Co-op, Aldi, Waitrose and Lidl. In total they control over 90%. All have ANPR cameras on some of their stores. All can cancel the tickets and almost all will for genuine customers. So we always recommend seeing the store while appealing the ticket at the same time.