[dan1234]

Well, the bottom of this press release (http://mediacentre.o2.co.uk/Press-Releases/O2-first-to-switc...) has the following claim:

"O2’s UK 3G (HSPA+ 900 / 2100 MHz) network currently provides voice and high speed data services of up to 14.4Mbps (21Mbps in the coming months) to over 84% of the UK population"