Ofcom allowed EE a variation to the rules for a chunk of its spectrum that has allowed them to steal a march on other operators, by being the first 4G mobile service in the UK and with the 4G spectrum auction over the rest of the operators should hopefully be announcing products and pricing, rather than the current wave of 3.5G, 3.9G and other marketing gimmicks to sell the faster 3G variants.
As part of an attempt to give the mobile operators some freedom to operate, Ofcom has varied the licences on the 900 MHz, 1800 MHz and 2100 MHz bands to allow operators to use 4G technology. We don't expect a big rush to turn off 3G and convert bands to 4G, but operators now have the scope to support a wider range of handsets e.g. the iPhone 5 which currently only runs at 4G speeds with EE in the 1800 MHz band might get some of the 2100 MHz band from some operators.
Another variation is that the 900 MHz band has had its maximum permitted power doubled (3dB rise) which should help to overcome not-spots that can exist almost anywhere from the big cities to a small dip in a road or a railway cutting.