Thanks for fixing the duplicated cottage name https://www.openstreetmap.org/way/662674262
Not sure if the Ordnance Survey can be asked to update their OpenMap to match "Tithebarn" as they are often used by Google, OSM and others as the master
I was not consiously surveying this afternoon but I cycled past a "Tithe Barn Gardens" in Repton https://www.openstreetmap.org/way/966866953 and "Tithe" is the spelling I would expect for 10% of income or a 10% of a harvest donated 
Your sources and edits look good