Sarah Beeny charts her golden rules for 'how not to lose everything in a falling market', but it's a pity her advice comes too late for tonight's amateur developers who set out to make their fortune just as the housing market starts to unravel. Successful entrepreneurs Nigel Arrib and Sarah Donahue, have a romantic notion that they can make a quarter of a million pounds by creating a swanky LA pad, in the heart of a run down bit of Rotherhithe, East London. Only trouble is they've bought the wrong property, in the wrong location and their plans are way off beam. Sarah Beeny gallantly tries to get them to change their plans to reduce their liability and turn them into three smaller units, but they motor on regardless. What follows is an epic lesson in 'how not to be a property developer': from ambitions to create zebra covered kitchen units and a cinema, to a master suite the size of most people's houses, complete with a swimming pool sized jacuzzi bath.