I'm having problems with 18A and 19D ( as well as parsing 16A and 4D), but mainly I can't understand why we have to work out what 15-30-7 is, when there is a clue for 7D already. Is Glyph trying to be generous? (I doubt it).
18A definition is first word and extra letter (at the end of the clue)
19D definition is last 4 words, with extra letter in first word of clue
16A definition i first two words, with extra word
4D definition is first word, with extra letter in 2nd
Thanks for the help with the post-grid phase! I was staring at what looked like a nonsensical jumble of the wrong number of cells and that made sense of it. Fortunately the one UK 15 30 I know turned out relevant. (I think Glyph was being merciful by cluing 7d, and I thank him for it! Plus there was only room for two unclued answers I guess.)
Spent a long time agonizing over 7ac because I thought it was 1 in 6 and couldn't tell where the 6 came from. But it isn't!