I'm enjoying this very much, ixion, and laughed out loud when I made the connection with the northernmost of the undefined clues. Am I right in thinking that the four fall into two twos as it were?
Hi Bullfrog...no it's a distinct group of four - some of the clues(more than I really wanted)turned out a bit &littish/loosely defined eg 8A, hopefully the four undefined stand out.
I haven't been able to get back to this yet, but I have that S in 19d circled with a question mark (figured there might be an explanation). Ditto re 26a.
With any luck link to solutions for WWU1 attached below...the undefined clues were 12/14/15/24(with an edible one at 8/19)Apologies again for the extra "s" at 19D.