Here in Southend we have recorded 8 air frosts so far this year, 5 more than in the whole of 2014. The January mean temperature was 5.7°C, so far for Feb it is a niggardly 2.4°C. Southend tends to be quite a bit warmer than most of the country.
There have been a further 16 days in which we have not recorded an air frost but the minimum temperature was below 3°C. I would wager that on all of those days Steve had a frost to contend with, and probably a few more. He's endured a few mornings at -6°C whereas the lowest temperature we have recorded all year has been -2.7°C (20th Jan).