Thanks to all for the hints here everyone. Couldn’t have done it without you. Rainman spotting a theme in the context of 15d helped me get 15d plus some others.
13a, 8d and 20d fit a broader theme but are definitely not from a 15d!
Yes the green tick came up as soon as I exited the puzzle (after fixing the typos!). Nice!
Much quality cluing today. Hats off to Crucible. Just delightfully put together eg 14a, 16a, 25d, 9d.
I like 26a too but agree maybe a bit of a dated reference, although there have been plenty of repeats I guess. It has even been on one of the streaming services here in the US at some point I seem to remember.