Unfortunately, this post won’t live up to any expectation from its title and has just turned in some links rather than my intended musings.

Geo Place

Everything Happens Somewhere 2018

BEIS / NEED

OSMaps

Wheresthe Path? – can bring up Google Sat view from British National Grid tile ref e.g. SE1234

Maps comparison

Street Map includes 1:50,000 & 1:25,000 OS maps and accept British National Grid ref e.g. SE1234

Open Street Map – maps you can contribute to!

Postcode lookup

For discussion covering drawbacks of Postcodes (Appendix B):
https://www.gov.uk/government/publications/an-open-national-address-gazetteer

Various including Postcodes

Mapit

For finding the OS grid tile XX9999 a place is in:
Gazetteer: County & OS Grid Tile by place name