Letters are of different style than in previous years, as clearly seen in "QU" of word "QUEEN", and in the year. The numeral (marked in yellow) is quite different also. Finally, 2010 type is a bit thinner.
Numeral "5" in detail:
All these probably is because of a different mint making the 2010 pieces. Further details and information will be very welcome :-)
(information and scan by Ante Jeroncic)