Telemarketing lists

We are starting a new venture (telecoms services to corporates) and have been given several lists of companies to ring up. However, the lists are over 10 years old and the contact details in most cases are out of date, causing us severe grief during telesales calls.

Does anyone have up to date lists (firms within M25 area) we can buy for a reasonable price? Thanks.

Just out of interest - will the list be used to cold call folks in SE1??

Only if they are reasonably sized firms/ corporates (not individuals), anywhere within the M25 area, or in the South East generally. AND, we are polite.

Yellow pages?

Acxiom UK, STATION ROAD, TEDDINGTON, MDDSX
TW11 9AD
Fax: +44 (0)20 8213 5588

Dun & Bradstreet are the customary suppliers, but all data of this kind is suspect...