From another forum.....too good not to pinch
All none geographic numbers have a direct dial in number behind them and Oftel (telecomms watchdog) forbids any holder of an 08 - 09 number in making these ex-directory. So, here they are, a huge list of well over a thousand companies. Search for the company you want to ring and find the alternative number and get cheaper calls.
Example; Tiny computers technical support £1 per minute on 0906 558 0237 (Direct dial in 01282 684 732 local call rate charged)