It's round two of the tenth anniversary tour for our Road Trip veterans, Catherine Southon and David Harper. They're taking their ever-reliable French classic car all along the Sussex coast, popping into antiques shops along the way in search of potential money-makers.There's a strong whiff of nostalgia for our two at the shops. Catherine seems to have a hankering for items with an aeronautical theme, one of which takes her back to her childhood. David has a flashback to his school cricket team and gives a demonstration of his prowess - probably unwise in a room full of china. There'll be some terrible parking, sticky situations with masks, and a canine antiques appraiser on the menu too.On their journey, David heads off to a rather special airport that has a history going back all the way to the very early days of flight. Catherine discovers a magnificent fortification, built by the Romans, that has stood in defence of the realm right up into modern times.Then it's time for our Road Trip royalty to see how their treasures fare under the hammer.