It's not disused!

Seeing that you've deleted it, I've no idea what you're talking about.

Do not put the stations name onto platforms. Platforms don't have names.The stations name is correctly tagged on the railway=station node.

Do not convert closed polygon platforms to platform_edge. There is no requirement for it. It adds no additional quality to the OSM database. All required data can be added to closed polygon platforms.

Instead of each railway=platform object having it's own ref tag you've now made it more inaccurate by combining them, such as
relation/20189592 (ref=10a;10b;11a;11b).

Not only have you buried the route relations into child relations making it more difficult to comprehend & edit, but you've also combined them all into one parent relation, representing multiple platforms (ie ref=10a;10b;11a;11b.) whereas before they were assigned to their individual relevant platform.

Changing ref to local_ref is pointless. There is no difference.

relation/19877920

Removed duplicating tags that are already on the railway=station node.

node/6402222390/history

This, & other stations, are correctly tagged.

Could you expand on what edits you've made & what you mean by "as a curiosity to see how some UK tagging would compare to what I'm used to elsewhere"

A playground is not an exclave of a park. Please refrain from creating unnecessary relations.
relation/19757766/history/1

Even with your edits rugby_* is much more popular:
https://taginfo.openstreetmap.org/search?q=sport%3Drugby

https://overpass-turbo.eu/s/2iAi

Don't join buildings to landuse polygons.
Ensure imagery is correctly aligned before adding data.

Where was this amendment discussed?
sport=rugby%20union?uselang=en

Why have you relocated a designated PROW to a location it doesn't exist?
way/368693103#map=18/51.417295/-2.300092

Image show PROW location in blue
https://snipboard.io/L2zAy6.jpg

...or even this NCN 4.
relation/1318928#map=18/51.543918/-2.640412

It's removed a section of NCN4.
relation/9540148#map=19/51.543921/-2.640489

way/1020091492/history/2

These rail lines are not sidings. They carry freight/passenger traffic & stop to (dis)embark.

Hi
way/166353896#map=18/51.865928/0.166033
This is not a siding as it's used by passenger trains to (dis)embark passengers.

You're correct. Now fixed.

Oldbury and Bromford Lane Railway Station was a different railway station.

way/1459443374
There is already a train station tag.

Stop making crap edits.

Refrain from making edits of which yo have no understanding.