http://www.metoffice.gov.uk/hadobs/hadcet/cet_info_mean.html
According to the Met Office, last month much milder than average, although it only ranked 34th warmest since 1772. The warmest February was actually way back in 1779.
Looking at the figures for England as a whole, average temperatures for February do seem to have been on the rise since the 1980s.