Bob Harris interviewed John Lennon for The Old Grey Whistle Test on the 18th April 1975.
When Bob was interviewed, and asked what his most memorable interview was he said [Without hesitation] "John Lennon in 1975 for Whistle Test. We'd been trying to get him for absolutely ages and he phoned from his office in New York and invited us over. We spent pretty much a day together, and it was the day that they discovered that Yoko was pregnant with Sean, so he was in a fantastically wonderful mood. He saw it as a great opportunity to send a postcard to the Uk, basically because he couldn't leave America due to the green card problems, so we got him at the best time. He and I got on like a house on fire - it happens with some people - and I think the interview reflects that".