BT is now providing public wireless broadband at over 500,000 Wi-Fi hotspots across the UK and Ireland. 
BT noted that 4.8 million of its consumer and business broadband — plus BT Mobile Broadband – users have inclusive network minutes in their contracts to surf the net, work or make cheaper VoIP calls via the hotspots. A further 50,000 hotspots are available in the UK and overseas through international roaming partners.
http://www.btplc.com