Google Maps must not be used as a source as the copyright and terms are incompatible with OSM.

https://wiki.openstreetmap.org/wiki/Google

After searching in The Gazette (published under the OSM-compatible Open Government Licence), the only relevant restriction is from traffic orders made by London Borough of Lambeth in August 2023 ( https://www.thegazette.co.uk/notice/4424576 ). The relevant provisions are:

(2) Ban motor vehicles with exemptions for pedal cycles, emergency vehicles, and vehicles with a valid dispensation via the use of CCTV enforcement:

(f) The Lyham Road / Dumbarton Road / Chale Road junction, from the north-eastern corner to the south-western corner, requiring compulsory left turns from Chale Road into Lyham Road and Dumbarton Road into Lyham Road, and compulsory right turns from Lyham Road into Dumbarton Road and Lyham Road into Chale Road;

This LTN/modal filter restriction was already mapped in August 2023 ( https://www.openstreetmap.org/changeset/140983494 ). As there appears to be no evidence from an OSM-compatible source that motor vehicles are prohibited on Chale Road between Kingswood Road and Lyham Road, I have reversed your edit in https://www.openstreetmap.org/changeset/146369900