Which type of postbox is this please

[MartynHst43277]

[chrisbonham11]

I don’t know personally, but the folks here would certainly know: https://lbsg.org/

[sandhurst]

King Edward VII pillar box, with an English crown - I don’t know if there’s a more accurate name than that

[Maddymail]

I don’t know the type classification (normally letter classification A,B,C,D, etc)

…but it is a King Edward VII (7th) postbox dating from between 1901 & 1910.