I have been so intrigued by this that I bought myself the ST and did the paper version, which obviously I cannot submit online for verification. I am supremely confident that my answers are correct, apart, perhaps, from 17ac (Retirement Plans?) I can only think that there is a mistake online, replicated by those who have submitted all-correct solutions. My money is still on 'Criticisms'.
By the way, does anyone agree with me that the standard of clueing in the ST lags far behind that of The Times? When I do buy it I tackle the Mephisto with varying degrees of success, but normally leave the ordinary 'cryptic' untouched, as I usually find it boring. I only made the effort today because of this thread.