There is a dead link on the page for recording vascular plants. At the top it says "Please note! This card has been designed for recording plants according to the BSBI guidelines. Species that are planted in gardens should in general not be recorded. Please see this document for more detail on the recommended approach." But the referenced document does not exist. It should be at:
https://bsbi.org/download/4815
But nothing comes up, just a blnak page.
Actually the link appears to have downloaded the document with the recommended approach without showing it on screen or telling me about the download! Well, at least I have it.