The pool has increased from 8m prospects in 2004 to 11m in 2005 and now holds information on customer transactions to a total value of £10.4bn.
The data list, used in conjunction with Club Canvasse's contact history feature, is used to identify home shoppers who have been targeted recently with direct marketing offers
The service has been developed to enable members to reduce direct marketing costs by avoiding mailing consumers who do not fit an active home shopper profile.
Nigel Linnane, Club Canvasse manager for Experian's marketing services division, said: "Using the unrivalled breadth and depth of multi-buyer data at our members' disposal makes Club Canvasse the most powerful data cooperative in the market today."
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