One of the big hits of our last summer season was the Boultings' 1956 send-up of the British army, Private's Progress. Even the Boultings were surprised by its success, and it diverted their careers from essentially serious works to a greater stress on farce and comedy. Here is its immediate sequel of the following year, in which the same ensemble cast of first-rate actors and character comedians take on the British legal profession. William K. Everson