CycleStreets
https://www.mapillary.com/app/?pKey=QlwKVCeHaHmcTGhXXPVkow&focus=photo&lat=51.520362&lng=-0.0717&z=17

(from 2014) shows both a no entry sign *and* a no motor vehicles sign (the latter of which means cyclists can go down it contraflow).

Area needs survey to determine what the actual situation now is.