Just for parity, here is last March's review from the METO.
They, again, use the UK WIDE MEAN temp, not the CET. So the statistics they use for mild months is also used for cold months;
http://www.metoffice.gov.uk/climate/uk/2012/march.html
I personally use the CET temp for my comparision, as its more relevent to where I live as it doesnt take into account Northern Ireland and scotland, which are frankly irrelevent to temps and conditions in Bristol.
Paul