High-profile examples of programme losses include many early episodes of "Doctor Who" (97), "The Wednesday Play", most of the seminal comedy series "Not Only But Also", all of the 1950s televised Francis Durbridge serials (further, the first two serials were never recorded), the vast majority of the BBC's Apollo 11 Moon landing studio coverage, all but one of the 39 episodes of "The First Lady", and all 147 episodes of the soap opera "United!". There are gaps in many long-running BBC series ("Dixon of Dock Green", "Hancock's Half Hour", "Sykes", "Out of the Unknown", and "Z-Cars"). The Beatles' only live appearance on "Top Of The Pops" in 1966, performing the single "Paperback Writer" is believed to have been wiped in a clear-out in the 1970s. An off-air recording of 11 seconds of footage made on an 8mm film camera was discovered in April 2019.