Hi @Scottie68
I can understand your concern for what will happen with your bills when the meter gets changed.
You won't get billed for a single week after receiving your next bill.
When the meter is changed, they will take a meter reading for the meter being taken, which will be added onto the next bill with the usage from the digital meter.
If you are concerned of something happening, I would recommend you take a picture of your meter with the reading before you go on your holiday.
Thanks, and enjoy your vacation, Chris