yes powder puff i had the same thing happen last year though they never visited me the wrote a letter i wrote back telling them that for the first quarter we were doing dampness repair and the heaters and dehumidefiers use loads of elec and they were on 24/7 for three and half month that gave me time to sort the prob and lower my bill to the normal Kwh that i was using ,this is how many growers get busted it is ok if you are a knew owner of the property as you can have your bills regular but when people start growing in existing property then the elec company notice straight away ,they investigate in case it is their equipment that is faulty and if the investigator is a square then he WILL report you but most will let it go once they find out it is customer use rather than company fault that is why i had my son make me something up that prevents my elec meter reading that i have used that many Kwh so my bill will alway be around the same givee or take 50 ,60£ best of luck mate give them a reason for this use or they will investagate ,