It’s OK to change stuff like this when you have local knowledge and can back it up with other sources.

A note about sources: most other modern maps are unfortunately not suitable sources for editing OSM, as they have copyright restrictions which are incompatible with OSM’s licensing. In particular, Google Maps and Ordnance Survey maps should not be used.

There’s some background on it here: https://wiki.openstreetmap.org/wiki/Ordnance_Survey

Some subsets of Ordnance Survey data are appropriately licensed, and they’re available as backgrounds in the ID editor already. But looking at (for example) an OS 1:25k map is not allowed.

Probably the easiest way to locally verify a road name like this is to walk to the road and look for the road name sign at junctions.