Best answer by Nancy_OVO
Just so you know I've changed the title of your post and added some tags so other users looking for the same information can find it.
It sounds like this is the usage on your old gas meter before we installed a smart meter, and then the start of your billing on the new meter. If you look at the dates next to the readings, this should fall in line with the date you switched to us, the date we exchanged the meters, and an up to date reading.
If you've only got gas on the bill and not electricity, we might still be waiting on some information from our engineers. We can chase this up for you if you send us a PM on Facebook or Twitter with your full name, account number and DoB.