Butterfield8 becomes the third company to be acquired by TIP - in August the company bought the strategic communications agency Unity and the branding agency The Gathering.
Leslie Butterfield, the founder of both Butterfield8 and the agency Partners BDDH, joins TIP this week and brings with him clients including Mercedes-Benz, The Co-operative Group, COI Communications and Sanctuary Connections.
These complement TIP's existing client list which includes Carphone Warehouse, Cadbury Schweppes, Bosch, Guardian Media Group, B&Q and Kraft all came on board following Ingram's earlier acquisitions.
"Building brands is at the heart of our offer, so to have a brand strategist of international repute will help to move us on strongly," Ingram said.
"A key benefit of Leslie's joining is that he is highly experienced in all three aspects of our service: communications strategy, brand strategy and business strategy."
Butterfield founded Butterfield8 in March 2001. Its ownership structure saw Butterfield take 75 per cent, with Partners BDDH holding the remaining 25 per cent. In August, the troubled communications group Havas merged Partners BDDH with Euro RSCG Wnek Gosper in a bid to strengthen Euro RSCG as a global network. This put an end to Arnold, the collective unit of agencies that housed Butterfield8, Partners BDDH, WCRS and EHS Brann.
Ingram launched TIP in August with £10 million of the proceeds of the £64 million he pocketed when he sold his Tempus communications group to WPP in 2001.