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.

Welcome to OSM
The train station's network & operator are correctly tagged and there's no need for a linear platform when the polygonal one exists.

Strawberry Line is the name of a route which traverses along this path.
There are numerous routes traversing along this path, therefore the name shouldn't be on the way, but in it relation.

relation/5527957

node/3729401291/history/18#map=19/51.511250/-0.056924
operator is classed as London Overground not Transport for London

Provide more informative descriptions than "I have made the validator happy."

Hi What is ref:GB:HER:Angus?

There si already a railway=station tag. Please don't duplicate.