Hi there :)

first of all:
https://www.openstreetmap.org/changeset/161283603
Sorry, the easy way out of this was the revert. If you inspect this changeset using https://resultmaps.neis-one.org/osm-change-viz?c=161280728#16/51.4960/-0.1483 you'll see that you dragged a node of Wilton Road across London and connected the Road to everything on the way.

And now for the rest

- please keep in mind what mcliquid postet. It's not a good idea to change stuff all over Europe in one edit.

- Please use better changeset comments. Here is a little explainer:
https://wiki.openstreetmap.org/wiki/Good_changeset_comments

- please don't blindly solve every issue any of our tools offers as needing a fix. Carefully examine each issue and decide for each single thing if the offered fix is a good idea.

having said that
happy mapping
silversurfer83