Cool, thanks for sharing Halagonian!
To follow-up on my own recent searches here in the US, I could never get ahold of any Pilkington person based in the states to see if they had any in stock to get to a local glass shop, and the big brand glass shops that could work with Pilkington direct wouldn't work with me because of the age of the car, so it was a catch 22.
In addition to SJ being a great source, for the glass, reaching out to
classics@pilkington.com got me a quote in less than a day. From them it sounded like they didn't have any stock, but they make it to order and ship directly to you.
Also, Ricky Evans Motorsport gave a prompt quote too via
sales@heatedwindscreen.com. They might have one in stock, but they also make to order and ship.
Also, I think Brit-car-nut may have one in stock over in NC with the ancillary bits too.
Finally, for more locally sourced ancillary bits, it sounds like Dave Bean has some in stock too.
Hope this helps someone else.