Thanks for the replies. I've been to the job today.
I found the following problems: a fridge inside the cellar that was been refridgerated; chiller door seal broken; immersion heater on all the time (you get cheap rate electricity at night in the UK); vents blocked in air con units; food parcels blocking fan in walk in freezer; convector heater left on in room which is heated by LPG central heating; recent introduction of clothes dryers where use of washing line was used before.
Although none of these problems would explain the increase as described by the client I suspect that the increase business and attitude of the staff are the most likely causes.
There was a lot of electric equipment been used such as 9 microwave ovens, an oven keeping pre heated food warm, tea urn etc.
