This segment of the road is being renamed to 'Kyiv Road', according to the local council (2023-02-24)- 

https://www.westminster.gov.uk/news/new-kyiv-road-honours-struggle-embattled-nation

Unclear if this is a permanent, 'official' change - it's not findmystreet yet (not a permitted source for OSM)

Looks like this part should not have been called Palace Court (or Wellington Terrace) in the first place.  

Survey suggested.