 As a mark of respect, several of the cast (Brian Blessed (qv),  Joseph Brady (I) (qv), Jeremy Kemp (I) (qv) and  Colin Welland (qv)) who had played major characters in the  original episodes in the early 1960s, were called back to play minor  roles ("Member of public", "Scotsman", "Vagrant" and "Angry  Northerner") in the last ever episode, "Pressure" (episode 12.13, 20  September 1978).