Thanks Mamya
That's 12ac sorted and since it confirms some crossers I hope it means 3,7d is right.
But I'm afraid I still can't get 8d. Perhaps you can help me with 18ac 11d Go on sponsored walk primarily, middle of week taken off (6,4,4)
I have ???D?R ???? ???E I know from Chrise's hints that the definition is Go and I'm assuming it is an anagram of something after taking out the middle of week, but I can't see it.
I would also like a hint for 5,20 from someone The clue is Near catastrophe, question getting involved in hideous US-Korean war (6,6) I have N?R??? ????A?