BT

British Telecom is the largest of the Big Four broadband providers and one of the best-known companies in the UK.
Recent reviews:
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I was very impressed with the switch. I knew what date I was switching and was kept up to date with the progress, when the router had been posted and when it would arrive. The speed and wifi signal is better by far than my previous provider. The new deal costs more than I was paying before, however I do believe you get what you pay for. I am happy with my choice, BT are now my preferred internet service provider, as they offer a great service.
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New router arrived 2 days before the engineer was due to visit. When the engineer came, he was very friendly and professional and made sure everything was good before leaving. The connection has been unbroken since installation where as previous provider we needed to reset router every so often. Speed is exactly what was promised, even in peak times. Very happy with a very easy switch over.