Clapham House Group, the listed restaurant operator behind Gourmet Burger Kitchen (GBK), has this morning described an improvement in trading since the World Cup. In a statement ahead of its annual general meeting the company said the trading environment and outlook remained “challenging”. And it added, “and although August has shown signs of a return to the improved pre World Cup sales trends, weekly performance remains volatile.” Clapham is continuing to talk to unnamed suitors, believed to be backer Capricorn Ventures, regarding a possible takeover, the company added.