Superb selection
@8089 and many thanks for sharing.
The George V Type A is fascinating: it bears the specific cypher variation for post boxes in British Overseas Colonies. This cypher's design may have influenced the cypher for George VI (attached blow-ups show why).
The box itself, is a casting from pre-1905 (when Edward VII boxes began using a new casting with a much larger door). My guess is that this box was either "new old stock", or was an old VR / early EVIIR box with a new cypher-casting.
The diminutive Elizabeth II wall-box, in the cement bollard: the relative sizes of the leaves, low paving-stones and the water hydrant cover, makes me think the bollard and box are
very low to the ground - is that the case?
The Type C box with a Crown of St Andrew is, in all likelihood, a repurposed box from Scotland.
These are the first post boxes I've seen with Cantonese script collection-cards!
Winderful stuff!