That is mine. My Summer and Winter month will be pretty much same and I have rounded figures up for a slight tolerance. Heating/Gas use was less in November to Feb because kept heating off but I didn't record for figures back then as wasn't relative to future costs.
It went up in April & May because doing more gas cooking which since have cut back down again in June, July (was away 10 days) & August. August is actually looking more like 225kWh for gas based on the unit figures on meter but just about right for the electric use.
So that is where I am comparing what my expected months prices will be come October and January updates. I have also assumed the daily charge will increase by the same % in this. Now comparing that to my fixed offer it would cost me an additional £250.46 so there is zero reason to fix. Come April though I would be underpaying by £32.97 assuming the current April prediction. However that means it would take 7.6 months before I would be better off fixed and that of course would take me to November 2023 before that break even point.
If prices drop sooner or there more support I will be better off and if it gets worse sooner my break even point will be shorter and so that is currently my best risk to take looking at the data. I would also be better off if the daily charge doesn't increase by same % as the general unit increase does but shall see with that too.
Edit: I have also just assumed 31 day months for everything in this as just haven't got around to updating but it wouldn't change much all in tbh. Correcting the days just means a monthly underpayment average of £31.66 instead and 7.93 months meaning it would be December 2023 then before I would be worse off.