A very enjoyable challenge. Thanks to Picaroon and thanks to all the helpers I found here!
I particularly liked the way 15 17 must be interpreted differently for each of the references to it. 8d helped me work out 15 17 but I spent a long time failing to find similar answers for 20, 19 etc. And we’ll spotted Jono for the use of the 17, I’m sure I’d never have noticed that touch of genius from P
On to Everyman…. (in between my granddaughters 6th birthday party with 25 schoolmates!)
Have a great day all and thanks again