The activity is expected to go live next month, involving trade press ads and direct mail.
Neale Phillips, head of insurance at British Gas Business, said: "Our new insurance service can provide a quick and cost-effective solution for many businesses, including those that traditionally struggle to get insured.
"TDA's combined track record in B2B and financial services makes it the ideal direct marketing partner for us."
searches for the best insurance deals -- including public liability, professional indemnity and employers' liability -- from leading providers such as AXA, Zurich and Norwich Union.
Peter Wilton, managing director at TDA, said: "We are working on a highly targeted acquisition and conversion strategy. Insurance-for-business.co.uk offers a wide range of competitively priced insurance options to the difficult to reach SME market, and it's a target audience ripe for effective segmentation and targeted proposition testing."