Found this when researching an aswer for another thread but felt it worty of it's own thread.
O2 details plans to re-farm spectrum, upgrade Wi-Fi network, rollout VoWi-Fi and VoLTE and improve rural 4G
O2 is to boost the capacity of its 4G network in urban areas by re-farming 1800MHz spectrum and enabling automatic offloading to the O2 Wi-Fi network and has also promised to expand rural LTE coverage.
http://www.techweekeurope.co.uk/networks/broadband/o2-4g-spectrum-coverage-175194
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