Unlikely, but not impossible, that it's the meter.
One thing I think I'd do is I'd go round each room and write down everything which is plugged on or connected, to make sure I knew exactly where and what might be using the power.
Do you have old bills from your previous meter that you can compare usage (not cost) against?
I imagine you have a visual display of your power usage (IHD), look at that every so often to see if usage is constantly high or is peaking and/or if you have half hour billing look and see if high usage happens regularly and/or in a similar time frame each day.
I can point you towards tools to get your historical Octopus data if you want - you can dump it into a spreadsheet to analyse as I know you are quite handy with Excel.
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