Hi
highway=foot on a platform is not required (a platform's primary purpose is to be walked upon)
You've mapped a level crossing. Has the bridge been removed?
A level crossing or bridge isn't a platform.

Hi
Welcome to OSM.
As is customary to leave a comment explaining the purpose of a contributor's edits, could you clarity your amendments please.

Hi
Good to see it open again. The original tags for the pub are on its boundary way. I've reverted those.

Hi
Just to let you know there's a grown feeling that the public_transport schema should be rescinded as it only duplicates existing tags. highway=bus_stop in these instances. You may wish to spend your OSM time on something which adds unique improvements.

building=static_caravan
building=static_caravan

You have a responsibility to map to agreed guidelines. Please read about multipolyogons Note the simple example is just a way.:
osm.wiki/Multipolygon_Examples#Forest_.28One_closed_way.29

Also grassland is for areas of rough grass, not maintained, cut grass.
natural=grassland

Mapping relations with only one member is a complete waste of time & should not be done.

Both the barrier & natural tags can be added to the way & will still render.

Stop positions aren't railway stations

You've now created 4 railway stations at Cardiff Central

Clearly not a building!

The church closed in 2015

Hi
What is this "dependent service"?
As it doesn't have a roundabout tag it sounds like the fault is in this service & needs to be fixed there.

But contributors are removing this tag without comprehension.

Not to be taken as gospel, but this OS map indicates paths. https://os.openstreetmap.org/#zoom=17&lat=51.49540&lon=-2.55259
Maybe worth a second look?

The P1 preset using foot=yes was to indicate official pedestrian access (PROW, Bridleway etc).
This is why double checking & possible upgrading to 'designated' is required.

Removing foot=yes without understanding why, will reduce the quality of the OSM database. .

Hi
Welcome to OSM.
To check - if there's a path under the bridge it would be best to do a survey & extend it so it joins other paths.

@ spiregrain Thanks for clarifying

@SomeoneElse. Osmose have imported JOSM's validator which also incorrectly claims: "Suspicious tag combination highway=cycleway together with foot=designated, use highway=path"
I queried it here: https://lists.openstreetmap.org/pipermail/tagging/2019-July/046472.html

foot=yes/designated is a valid tag in OSM.
It can be used to distinguish the difference between an asphalt path through a housing estate & a route of worn grass around a field where the owner tolerate dog walkers.

I believe it was originally used as an indicator that it was a PROW. Tagging has progressed to be more specific, but foot=yes is a good indicator that rarely edited paths might need updating to PROWS

Out of curiosity, why are your amendments apparently random across the country?

Ah, apologies. I didn't load the relations. As you were.

To check Tom, why are you splitting ways, but making no tag amendments?