Paul McCartney: Back In The USA World, 9pm Narrated by Paul McCartney (above), this programme follows him on a seven-week tour of the United States. The live performances are interspersed with candid film of the rocker off-stage, giving a glimpse of the private life behind the musical legend. A Dangerous Obsession Pearl, 8.30pm When Tom Hart Dyke journeyed from Panama to Colombia via the treacherous Darien Gap to look for rare orchids, the trip took an unwelcome turn when he was kidnapped and held hostage for nine months by local guerillas. A few months after his release, the undeterred Dyke was back in the jungle. This time he was on the island of New Guinea in search of a new species of orchid, despite the ever-present threat of being kidnapped again.