Updated on 12/07/2019
Best answer by Mw2870
My mistake, it is the WAN light which flashes on the Electricity meter.
On the Electricity and Gas meter you have to press any button and when you do there should be a solid "HAN" symbol on the LCD display. It may be flashing on one or both if there is a problem.
The gas meters do have a battery (supposed to last 10 years), but you would know if it had failed as you wouldn't have any gas at all. See here:
Is the electricity meter in a different location from the Gas. Some people have reported connection problems when they are a distance apart.
Finally do you have an IHD (In Home Display) is that reporting any info from the Gas Meter?
In the meantime you can send in manual readings by pressing the "9" button and making a note of the kWh value.