(Review requested)

Thanks for adding these and taking part in this project!

If I could make one suggestion, please could you avoid putting the kerb nodes on the sidewalks?

From https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dkerb
"Please do not add a barrier=kerb on a node joining the footways near the crossing (e.g. sidewalk footway joining with footway crossing the road). That would implicate that such kerbs block not only crossing the road, but also just using the sidewalk (i.e. without intending to cross the road), which is almost never the case - and which has a big implication for several classes of users (most notably, wheelchair users)."

Most kerbs in central London are lowered or flush, so it's not quite as bad for wheelchair users as the wiki makes it sound, but it does mean that tactile paving nodes for the visually impaired might be in the wrong place.