Dmitry
Have you tried British Telecom? http:/www.bt.co.uk and select "Directory Enquiries" at top right. This allows an initial but asks for a location or postcode, if you have no location you'll struggle. In that case I recommend you phone BT directory assistance, details are provided on the web page.
Regards
JR
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1