Some very good clues this week, but still can't see these -
7 Across - "He's one United put in control" (6) H-L-U-
(I can only think of HELMUT)
21 Across - "One into renewable energy, local veg? (3-7)
I have E-O hyphen -I---G-
31 Down - "Nick would only be a quarter as long? (3-4)
(I think this has to be TWO-INCH but I can't see why)