A group of scientists and engineers have proved that they really are as useful as a chocolate teapot. Master chocolatier John Costello and his team from the Nestle Product Technology Centre (PTC), in York, were given the challenge of turning the familiar idiom on its head. Their challenge, witnessed by BBC1's The One Show, was to develop a teapot that could withstand boiling water enough to let the tea brew for two minutes before pouring. Mr Costello enlisted some of the PTC's top scientists and engineers to help in its development and solved the problem.