Honestly cannot fault O2 one bit. Speed is great, reliability is excellent. Price is a little bit dearer than competitors, but if you have an O2 mobile it brings the cost down, and they have a policy of giving existing customers the same deal as new customer would if they re-sign their contract, which is incredibly fair (I'm now paying £15.25 a month for unlimited broadband and evening and weekend calls, including line rental.)

Customer service is where they shine though. I can honestly say I've never had a single gripe with their staff, either on the broadband side or the mobile side. Everyone is knowledgeable, efficient and willing to do the right thing for the customer. Certainly a lot better than the Kafkaesque nightmare of BT.

Highly, highly recommended.