'ref' tag now generally means National Rail station code for UK railway stations. Not sure what these original abbreviations stood for.

WNT is Wandsworth Town

Correct name according to Wikipidia (which has a photo where the name is legible)

This certainly isn't a National Rail station. Don't know if they've picked the correct 'Longridge' in https://en.wikipedia.org/wiki/Longridge_railway_station

Attach edges of cemetery to buildings and add unknown schoolhouse building (probably part of UN veterans 'complex')

Correct and simplify ways around Arbour Hill Cemetary (from memory)

Add wikipedia reference

building=train_station rather than just station http://wiki.openstreetmap.org/wiki/Tag:railway%3Dstation

There is already a Newquay railway station node on the track. I think building=train_station is sufficient categorization. Being guided by http://wiki.openstreetmap.org/wiki/Tag:railway%3Dstation

Just one station node for Knebworth, convert the ones on the track to railway=stop.

Maybe these two and node=1792255367 should be changed to railway=miniature_station instead of railway=station

Right angled corners on house: remove distortion.

A bit more right angled corners on school.

There is no kink in the boundary of this garden (have visited property)

Just one station node for South Ealing, convert the ones on the track to railway=stop.

Just one station node for Kilwinning (existing node 298437272), convert the ones on the track to railway=stop.

Just one station node for Hitchin, convert the ones on the track to railway=stop. I'm planning to automate these conversions so get in contact if you have any issues. Tagging according to http://wiki.openstreetmap.org/wiki/Railway_stations

Just one station node for Harlington, convert the ones on the track to railway=stop. I'm planning to automate these conversions so get in contact if you have any issues. Tagging according to http://wiki.openstreetmap.org/wiki/Railway_stations

Just one station node for Flitwick, convert the ones on the track to railway=stop. I'm planning to automate these conversions so get in contact if you have any issues. Tagging according to http://wiki.openstreetmap.org/wiki/Railway_stations

Just one station node for Brookmans Park, convert the ones on the track to railway=stop. I'm planning to automate these conversions so get in contact if you have any issues. Tagging according to http://wiki.openstreetmap.org/wiki/Railway_stations