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I've not read the whole thing, but Pyn is a boatman in the book. (tenuous I admit).

"There is a man in St. Clair called Pyn, a boatman living in the first cottage you come to"

Glad it's not only me with 19a - answer not clear at all. I've found several of these clues a bit clunky and unsatisfying, and though answers are obvious I can't be bothered to work out the how & why.
Oh well, only 9 days to the next Genius :-)

Many thanks, Glassy.I don't quite get the bit with "essentially wants" (yet), but very interesting! Perhaps the answer is still "pun"!

I should have added that my 19ac also stands at P?N !

Apart from the 19ac problem, I have one left (OK, I admit, and two I'm not sure about)
8dn Topline pair of states (4)
I have ?I?C
Any ideas?

DISC isn't short for District of Columbia, by any chance? But that's still only one state (or arguably none)

I believe it's RISC, Chris --- an early computer, but also abb. of Rhode Island + South Carolina, U.S. states!

How stupid - thanks, greedykite. I still have an old Acorn Archimedes RISC computer. The RISC stood for "Reduced Instruction Set Chip", and ran much faster than CISC ("Complete.....).
Acorn RISC chips I believe are found in most modern mobile phones, and lots of other small gadgets, though they no longer make computers.

The spaces at the top of the grid are c o m p u t e r

I'm blind not to see that, Keith. So the link is COMPUTER, rather than Alan Turing's centenary specifically.
Still sheds no light to me on the P?N one, though (unless it's PIN - Personal Identification Number?)