The chefs do battle for the fish course. An unusual amberjack dish takes on barbecued octopus and a more traditional butter poached trout. Today the atmosphere in the kitchen gets even more intense as all the chefs take risks with their dishes. Mike Reid, executive chef at M Restaurants in London, shocks when he pairs his fish with some highly unusual flavours - white chocolate and strawberry. Selin's dish pays tribute to the notorious 2008 Wimbledon final between Federer and Nadal, using barbecued octopus and potato rostis as the central elements. Tom Kemble creates a more traditional dish, inspired by the classic summer picnic, but will his refined poached buttered trout be enough to impress the esteemed Great British Menu veteran chef?