About the numbers
Each floor's number range comes from the landing signs between the two halves of the building. Which door had which number is a best guess until someone confirms it. If you remember your number, open the room and fix it.
The plans are the 2024 planning drawings by Stanton Williams, so a few rooms may have changed use since 1999. The eight rooms in 9 and 10 St Clement's, reached from the Second Level landing, are shown as St C 1 to 8. Their order is a guess too.