David Harper presents from Detling antiques fair where he meets John Wilson who has a collection of 11,000 rare coins. Mother-and-daughter duo Nisha and Adzi on the red team pin their hopes on a set of cameo brooches but expert Mark Stacey doubts how popular they will be at auction. Partners Kathy and Nardo set their sights on a dolphin water feature but Kate Bliss worries four figures is too much to splash out on