I got an ex pat to explain them to me.
There are two types of meter, one is on a low, med, high tariff. the other is a general tariff.
then next down the list is the before and after readings and how many units used and the price.
The two dates right at the bottom are when the bill is due to be paid between.
Hope this helps a tadge, no doubt there will be others who can explain it better.
Wendy.