Morning each, Mr in infrequently here. Should change my name. I don't get to the puzzle until late evening and read your comments with interest. I was switching between this and RT45
(also coming to that late), which kept me on my toes. Found this one easier but in spite of the hints still can't see 12a. So a further hint...? BTW re the comments on the answer to 6d & exclusion in 2d, they're both in Chambers so not typos. Stay safe folks