The UK faces a serious capacity crunch in the next decade, and must take action now to keep the lights on. That was the message outgoing Ofgem chief executive Alistair Buchanan delivered to a packed lecture hall in London last night (Tuesday). His comments were heavily trailed in the national media, and have provoked a storm of response and speculation over future energy strategy and prices. But what did the people in the room think of the presentation? Here three distinguished members of the audience give their views: