By August 2012 there will be 140,000 NFC payment points in the UK

"By the time of the Olympic Games there will be more than 140,000 contactless terminals around the UK. From the moment visitors land at Heathrow they will be immersed in a contactless payment experience with everything from taxis, to retail outlets, to the Olympic Park itself."
Source:  Press release from Samsung and Visa, 9th May 2012