We're all trying to pinch pennies, so maybe Justin Preston will have a few helpful tips. He dons the hidden ear piece again this eve, on his quest to make shoppers more savvy. Tonight he'll he helping two lovely ladies knock money off the price of a designer dress, showing three London cab drivers how to bargain for electrical goods and heading undercover at a second-hand car dealership to find out what the customers think of the joint. Stay tuned to catch Hugh Fearnley-Whittingstall's Fish Fight at 9 - they're heading off to the Antarctic this week...