Ofcom, the UK regulator, "set out a number of new proposals for making 4G mobile spectrum available in the UK. This includes introducing new measures expected to extend coverage to at least 98% [indoor coverage by population] of the UK population and revised plans to promote competition".
"Demand for mobile data in Western Europe is estimated to increase by more than 500% over the next five years. This demand is being fuelled by smartphones and mobile broadband data services such as video streaming, email, messenger services, online mapping and social networking"
See "Proposals to extend 4G mobile coverage" - here. See also "[Yankee Group]: MBB Penetration in Western Europe to Reach over 14% by 2015" - here.