Julian Curry, who appears as Michael Faraday QC, was a series regular cast member of Rumpole of the Bailey (1978), in which he played another QC, Claude Erksine-Brown. Rumpole of the Bailey (1978) was a similar legal procedural series that also revolved around a chambers of the Inns of Court and whose namesake protagonist was a gruff, aging barrister.
The menu item Mayhew refers to and recommends in Greek to Kavanagh's annoyance is avgolemeno, which is Greek egg and lemon soup.