Where do the postcodes come from?

What was your reason for changing the tag?

Did you mean to edit something in Australia?

Bing imagery in south London is badly aligned, as is clear if you compare it with the cadastral parcel layer. It would also be helpful if you add clear [comments](osm.wiki/Good_changeset_comments) to your edits.

It means nothing. I typed carelessly when I originally added the way.

Welcome to OpenStreetMap and have a good time mapping. Is the local authority map out of copyright, or has it got a licence we can use without breach of copyright? Also, you mapped the name extending into Richmond Park, is that intended?

I assumed (possibly rashly) they were left over from a preset in Potlatch 1.

Have you got sources for any of your changes?

You have simply used electrified=4th_rail here but the electrical system is different from pure Underground lines.

Are you sure they have gone permanently?

You have edited ways in Australia as well as the UK. Did you mean to do that?

Why?

You have followed Esri imagery, which is poorly aligned in southwest London.

Or should it have been amenity=grass?

Did you mean grass=amenity?

See also @Jason_Brown/diary/392740

Did you mean to put grass inside water?

Who asked for this change?

Welcome to OSM and keep up the good work.

What was wrong with it?