Nigel Planer and Keith Allen appeared together in 10 installments of The Comic Strip Presents (Planer in 27 of the 39, Allen in 16. There were only 6 episodes in which neither of them appeared).
Jason Hughes and Jo Wheatley both appeared in the Midsomer Murders story Last Man Out (S19e3). Ms. Wheatley was uncredited in both appearances.
Keith Allen appeared alongside regular cast member Nigel Planer in Interesting (s1e5) of The Young Ones as well as the film Carry On Columbus.