13 April 1924: birth of Christopher Tranchell, who played Roger Colbert in The Massacre (1966), Steven Jenkins in The Faceless Ones (1967), and Andred in The Invasion of Time (1978).
13 April 1951: birth of Peter Davison, who played the Fifth Doctor from 1982 to 1984, and subsequently. Happy 60th birthday, Peter!
13 April 1984: death of Richard Hurndall, who played the First Doctor in The Five Doctors (1983).
ii) broadcast anniversaries
13 April 1968: broadcast of fifth episode of Fury from the Deep. Weed and foam spread throughout the refinery.
13 April 1974: broadcast of fourth episode of The Monster of Peladon. The Pels unite against the Ice Warriors, but the Doctor is unable to prevent Ettis from firing the sonic lance.
Sadly the Telegraph does get a bit wrong with this:
The success of this series encouraged Anderson to attempt a new project called Space Police, but although a pilot was produced, financial backing never materialised and the series failed to get off the ground.
Space Precinct, which flowed from the pilot show “Space Police” did get off the ground – and was pretty conspicuous in the UK in the mid-90s.