exactly what I do , I also have a spreadsheet where I enter the readings and it calculates the KWh and cost for day rate and consumptions, and produces a total cost for electric / gas , which i check with the BILLI read my meters every month and send them through.
Then I check the bill for the readings and the prices and pay the DD.
and i check our consumption against previous years month on month as a rough guide, to see how we are tracking
I also note when the meter is read by company - hence why i know the months
also when I say to them , one turned up and read the other week, they just shrug shoulders and say we just get a list of houses and go and read the meters