"So no users on any modern end device can use it..."
Well, they're planning to replace it:
"The PEACH system will be changing to a new IT system in early 2021."
https://www.gov.uk/guidance/using-the-peach-system-to-import-plants-and-fresh-produce
Last updated 31 December 2020
Now remind me, what year are we living in?
Biting the hand that feeds IT
