@Hounds & Mr. Codger: I should have been more precise and written "no foreign words or expressions
which are not in Chambers in the grid". I am thinking of e. g. Doc's inclusion of a German verb which is not in Chambers in last week's grid. Presumably a word from any other modern European language could appear as an answer in one of Doc's puzzles even if it is not in the Big Red Book, which is hardly fair.