Of the meagre offerings in Gordon and Sarah Brown’s official gifts to world leaders during the G20 summit last week, only one gift stood out. Not the necktie. Not the Kelly Hoppen scented candle. And certainly not the Irish linen tea towel. It was the box of Rococo chocolates. For years this pioneering London chocolatier has been leading the way, proving that our chocolates can rival the best in the world.