Overview: Natasha Raskin Sharp is at the helm as two friends take on a couple at Spitalfields Market in London. The reds go on a journey for art and sculpture, while the blues go for weird and wacky. David Harper and Christina Trevanion are on hand to guide our teams, but which of them will make the most profit at the auction in Newbury? Natasha also goes on a tour of East End street art.