I have some old, largely retired editions of Chambers (as well as the 13th). Assuming my answers to the unclueds are correct, they are all in the relevant section of the 11th edition (2008), so you should be alright with the 12th. My answers to the following unclueds are not in the equivalent section of the 7th edition (1988): 12A, 16A, 26A, 30D.
I thought this was largely OK. The only clue I thought questionable was 42A, where "and wins" might be better worded as "to win".