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Ofcom annual reports on the UK’s fixed broadband, mobile and WiFi networks, digital television, digital radio and internet infrastructure.
Ofcom gathers data from the main fixed broadband Internet Service Providers (BT, KCOM, Sky, TalkTalk and Virgin Media) on both their retail services and the services they provide to other ISPs as a wholesale service. More information can be found here.
GLA connectivity map showing a summary version of the download speed data is here.