Can anyone recommend a UK supplier for a 17C44/JW ? I know Farnell have it,
but I've seen cheaper places advertising here, at least for the more
popular parts.

This one's needed for a Picstart 16B upgrade - Jim Robertson's replacement
code has been made available again, and it's now free of charge
(found at http://www.dontronics.com/phoenix.html if you're interested).

-adrian