Two numbers on the whole bill actually matter
The unit rate
What you pay per unit used. This is the number to compare between suppliers and it is usually in small print near the back.
The standing charge
A daily fee whether or not you use anything. A low unit rate with a high standing charge is worse for a small household.
The estimate flag
If the reading is marked estimated, the total is fiction. Send a real reading and the bill is recalculated from it.
