Friedman's 'British Destroyers and Frigates' has a reasonably good shot (I've no scanner but someone else might be able to send it to you).
I based my drawing for the parts sheet off the County Class plan in the same book, I think I have a scanned copy I can PM you.
The launcher is a very tricky bit of kit to draw and decent photos with all the details are hard to find, especially with enough resolution to make clear all the lattice work.
I'd appreciate that scan.
Also, thanks Heuhen.