Brought in to the show when Valerie Singleton began to diversify her television career in 1972, Judd initially presented with Singleton, John Noakes and Peter Purves, the partnership with Noakes and Purves lasting until 1978, the show's longest-running line-up. Judd's tenure on "Blue Peter" was often in doubt; she was retained for most of her seven years on the show on short term 3-month contracts. When her first marriage broke down in 1975 and her ex-husband threatened to 'tell all' to the tabloid press, Sally James was lined up to replace her on "Blue Peter", but the storm blew over and Judd remained with the programme.