Clapham House Group this morning announced that it would complete the earn-out agreement made when it bought Gourmet Burger Kitchen early. Clapham House will pay the maximum £7.4m agreed at the time of the deal. The company paid an initial £2.6m for the brand. The move will enable Clapham House to speed up the brand’s expansion. Greg Driscoll, Brandon Allen and Adam Wills, the existing management team of GBK, will continue as directors of GBK. David Sykes, formerly the managing director of restaurants at PizzaExpress, recently joined Clapham House and will join the board of GBK. Paul Campbell, the company’s chief executive, said: "The Gourmet Burger Kitchen business is performing strongly across its eight existing restaurants and our pipeline of new sites is developing well. "I am very pleased that we have reached an agreement on the earn-out consideration some six months early as it will enable us to accelerate expansion of this award winning format."