OK I am a bit stuck and whilst I know guardian solvers across the country are shouting noooooo don't tell I have got to ask for the odd clue / answer!
19d one odd record, unknown coinage (7) N?O?O??
20d Digs organised during prohibition which is ominous (3,4) B?D?I?? Bedsits?
23d All fools they say take one drug among others (5) P?E??
Many thanks kayakamina, but I think your reference is not the best. I fed "all poets are fools" into Google (I should have done that in the fitrst place!). The reference is almost certainly to The Purloined Letter by Edgar Allan Poe.