I'm in the UK - got a 2prong charger with mine. IE, not UK flat-3prong. AFAIK, they never had a UK charger?
Anyway...
Used the official charger this weekend, as I was in a rush and wanted all that 2.1A goodness. It certainly seemed slower than the 1A I'm used to with an old flat prong UK iPhone charger. I was disappointed. When I have more time, I'll do a test with Battery Monitor to see what mAh I get out of the 1A, 2.1A and an older .75A chargers.
Mine charges pretty quick, haven't time it though. Using the official charger.