14 'Bum' is an anagram indicator - the cool! is aloof rather than fashionable.
29 A garden plant, often forced, used in crumbles and pies - and it's what actors are meant to say to look as if they're conversing.
Thank you! I didn't know about bum and anagrams, but now I do, that was easy to solve!
Your hint for 29a allowed the penny to drop and now I think I have 23d - my letters are S.i.h, so S for Sun, wish for fancy makes swish for pish.
Thanks again!