So yesterday the organisation calling itself Everything Everywhere announced it had approval from Ofcom the industry regulator to use some of its frequencies to offer 4G. Everything Everywhere is the combination of T-Mobile & Orange.
In the beginning, this is going to be quite expensive for early adopters like any new technology, but this technology is far from new and the UK is way behind other nations in its deployment.
How fast is it?
Depending on coverage up to 50 meg connections are possible* making it faster than many conventional broadband connections. I see this helping those that have had trouble getting cables from their local exchange to their office but not all. Rural locations often get poor mobile signals too.