Smart Meter- Increased electricity use this winter?

I just got an email from Ovo which has suddenly landed me with a massive increase on my electricity usage.

I have gone from averaging 14kWh per day from Dec 21 to Oct 22 to 44kwh since then. In early Jan it was 73kwh per day!

I have gas heating and water - there is literally no reason why I could suddenly be using 3 + times more electricity. 

Any suggestions? Am not sure why I have only just had my bill adjusted either as the meter readings have been sent automatically each month.