Hi,
It is suggested that areas are tagged as surface=grass rather than landuse=grass. After all the landuse is for playing golf not growing grass.
leisure=golf_course
Regards Bernard.

Hi,
Almost all of these service highways tagged as golf cartpaths look wrong. They mostly are polygons, paths usually go from one place to another. Further some cartpaths are drawn outside of the golf course outline and somewhat distant to the playing areas. Some paths are drawn over water areas.

This changeset is rather large and I can't clearly make out what you are trying to achieve. I would suggest reverting it completely so that no anomalies are left by trying to correct things. If you need help please just ask.

Regards Bernard.

Hi, Welcome to OpenStreetMap.
Your house mapped within a park area looks suspiciously like fiction, especially when the outline is considered. Could you please remove any fiction, if you need help adding genuine data just ask.

Regards Bernard.

Even sections of the two razed railway lines are duplicated.

Hi, You are making many duplicated highways this seriously disrupts routeing software that uses OSM data.
Please see here and make corrections :-http://tools.geofabrik.de/osmi/?view=routing&lon=-1.85674&lat=52.89952&zoom=18&overlays=duplicated_edges

If you need help please just ask in another comment here.

Hi, I've removed several of your fictional bridge tags. Please try not to add fictional tags.

Regards Bernard.

Hi, a few problems here :-http://tools.geofabrik.de/osmi/?view=geometry&lon=-1.85667&lat=52.89941&zoom=18&overlays=self_intersection_ways,self_intersection_points,single_node_in_way,duplicate_node_in_way

Regards Bernard.

Hi it's Royal Mail not Royal mail.

Removed turn circle tag on node, the turn circle is mapped.

Removed duplicated water area and re-tagged the remaining water area.

Hi,
I've deleted a few duplicated sections of highway that you inadvertently added. Remove lots of tags which are implied by their absence so not needed. I also remove the 1.5km long bridge from Tŷ Draw Road.
Regards Bernard,

Hi, Welcome to OpenStreetMap.

The area 11261685, v1 (residential, construction) that you describe as a multipolygon is actually a regular polygon. The multipolygon relation that you created holds only one polygon, therefore it cannot be a multipolygon, (a multipolygon relation is a group of related for whatever reason,) polygons).

Regards Bernard.

Hi Welcome to OpenStreetMap.
I've made the two school areas into court yards and created a multipolygon for Pinner School. Is this a High school, the bounding area says "Cannon Lane Primary and Middle Schools"?

I made a few other amendments.

Regards Bernard.

Hello and Welcome to OpenStreetMap.

I wonder if you checked to make sure you have the direction of incline mapped correctly? A positive incline refers to upward movement in the direction of the highway that is tagged.
In this case as you have tagged it the slope is upward away from the bridge, making the bridge the low point. If this is the opposite to what you desired I'd suggest reversing the direction of that road section.
Please see here :- incline=*

If you need help please just ask.
Regards Bernard.

Hi,
To edit the typo, open the offending item in the iD editor here :-https://tinyurl.com/y83r72tk , place your cursor on the name in the left box, do the edit, (retype if you wish). Upload the edit, done.

Need help please just ask.

Regards Bernard.

Hi, Welcome to OpenStreetMap.

I've amended your address tagging to suit OSM tagging and positioned the point over what I think are the correct houses.

Regards Bernard.

OK, no response so I've removed what I think is fiction. If I'm wrong apologies.

Hi I amended the areas making a nested multipolygon of all areas to stop forest rendering over the water, also tagged islets.

Regards Bernard

Hi Welcome to OpenStreetMap.

This path is a cycleway as designated by the council. It's part of Enfield Chase to Arnos Park Greenway, one of the older cycleways to be made. The route is also mapped in OSM here :-https://tinyurl.com/y74w7rvk
I've reinstated the cycleway tags.

Regards Bernard.

Hi,
Are you sure Middleton Mews is behind a locked gate? Or is the gate adjacent. If there's a gate it would be good to have it mapped.

Regards Bernard,