I can see Modern_who's point,
yet I don't think London bus was being Grossly unfair.
Perhaps just a reference to the other Topic collection,
wold have been polite, and I do agree posts of a common thematic are well advised to remain together, even if the moderator (if possible)
can move them.
I think we all have to bite our collective tongues sometimes when we are misunderstood.
Anyhows, to add to Stampdogs lovely brace of exh sheets
(and featuring GB material) my contribution.
(BTW I think some "efimex" overprints occur on yemen stamps)
