Hi CJJ, apologies for my late reply to this. It looks like some of the highways around Seven Dials have been retagged once again, this time as unclassified. After changing the living streets to pedestrian streets I wasn't entirely surely it was correct, only that they definitely weren't living streets. Cars are allowed as you say (I'm not sure what restrictions apply, if any) so while some of the roads here are designed to feel like pedestrian roads (particularly the roundabout) I think unclassified is likely more accurate, and that would imply motor vehicles can access these by default.