Between 1975 and 1977 Michael Kitchen played the character of Foster in another Harold Pinter work, No Man’s Land. The stage production premiered in London and then had a run on Broadway before being filmed for broadcast on TV in 1978. This clip from almost the end of the play is the best part, in my lowbrow opinion.
The play was pretty inscrutable to me. But that may be because I skipped over all the scenes of drunken rambling, i.e. most of the play as far as I could tell.
From a review in the Village Voice (Nov. 22, 1976):
…the new boy, Michael Kitchen, is an inventive and potentially powerful comic actor, with great suppleness of emotional color.
And from the AP in November 1976: