Sir Paul McCartney feared he’d be “finished off” when he was robbed at knifepoint. The 81-year-old musician has recalled the terrifying moment when he and wife Linda were recording Wings’ 1973 album ‘Band on the Run’ in Lagos, Nigeria, and were ambushed with all their “cameras, tape recorders, cassettes in a bag, and Linda’s photographic equipment”. In an interview for his record label, seen first by The Sun newspaper, he said: “We’d been visiting some of our crew at their house and someone said, ‘Do you want a lift home?’ We said, ‘It’s such a beautiful night, we’ll walk.’” Adopting a “desper…