Good morning. 
I am on a bill monthly account but always make sure I am in credit so log in daily to keep an eye. 
 

Im very careful with usage of gas/electric 

I only put my heating on when needed usually twice for an hour or 2 when freezing in the evenings and only to keep dampness away as i tuck myself up with electric blanket

If I have my grandbabies I keep it running and last week I had them for 1 days and 1 night so kept on heating all day as both under 2years 

Ive been worried about the cost of usage but I must be in the twilight zone as price doesnt make sense. The Wednesday my heating was on all day and tuesday was a ‘regular’ day but look at the difference in cost? 
 

Does this seem right?

Im in a 3 bed semi bungalow with windows that desperately need replacing so very very draughty

Thank you in advance