This is a very interesting thread! I didn't realize until this past pony fair that ponies that we considered common here (US), were not released in other places. (at least not all of them)
I forgot the lovley gal's SN although I know her real name, my new friend from UK (introduced to me by PrincessLuna)
this infomation about ponies.
We imagined it was some guy (male most likley) sitting in a Hasbro office somwhere going "yes" or "no" to various pony sets that were sold first in the US, to then sell in the UK (and other wounderful countries) making the call to sell them or not.
Of course, this is just what we imagined. lol No real facts.