In August 2003 Oftel – which has since been subsumed into Ofcom – opened the directory enquiries (DQ) market to competition and the numbers 192 (domestic) and 153 (international) were replaced by a choice of over 200 different 118 numbers. Contrary to popular belief 192 was not a free service before deregulation: BT charged 40p for DQ using 192 and the majority of new 118 services were priced below 40p for equivalent services.
Competition has provided many alternatives for DQ services, some which are relatively expensive and others cheaper than pre deregulation e.g. GM Group's 118 226 allows up to two enquiries for a flat 23.5p no matter how long the call lasts...
http://www.gmgroupcorporate.com/118.html
As for the current BT service - 118 500 costs 40p per call plus 99p per minute or part thereof...
http://www.bt118500.com/118500.publisha
Free DQ services do exist. The cost is subsidised by a 20-30 second advert. More info here...
http://www.moneysavin...ectory-enquiries-free