What about the impact of Easter?
In 2011 it was very late -24th April
In 2012 it was 8th April
The pre-Easter peak may well have been partially in March this year, whereas in 2011 it wasn't. Always best to look at March and April together in these circumstances.
But March 2012 isn't on the website for some reason so I can't do the sums
Suzeman