The company will pay £7.7m for RLA, plus a further £1.8m through shares in TMMG. A deferred payment of up to £2m is payable based on performance targets for the year. A further potential payment of up to £9.5m is due in March 2011, subject to RLA meeting additional performance targets.
RLA's 60 staff will join its new parent company. Its clients include Direct Wines, Goodyear Dunlop, Kingfisher, Mace and Teleflorist, plus a number of companies in the Volkswagen Group.
Chief executive Iain Ferguson said: "RLA is another excellent addition to our group and adds specialist expertise in specific industry sectors."