What is the consensus about changing the last letters of 17 and 40 across to achieve the final grid? My view is it is unnecessary given 1, 33, 42 and 43 across are not changed.
I had ae and er as the endings for 17 and 40 but was wondering whether they should be changed to ar and ee in the final grid. Given there is already an r in 17 and an e in 40, I think not, meaning 5 of the 16 words remain unchanged.
Why is 33ac not changed? Don't you have to change the initial P to an A? (I wasn't sure about the legitimacy of the resulting word though, unless it's a recognized alternative spelling... or a reference to the Twelve Days of Christmas!)