George & Mildred

Norman Eshley, cast as Geoffrey Fourmile, previously appeared in an episode in the progenitor series Man About the House (1973) as Robin's brother Norman. Norman also appeared in the last 3 episodes of series 6 of MATH. Bizarrely, neither George or Mildred mention that Geoffrey looks like Norman. Fan theories suggest that either they really weren't in close contact to him, or they say nothing in case it was some dark Tripp/Fourmile family secret.

Edited into The English Programme: Working: George and Mildred (1980)