odd electricity meter figures

I read my gas and elec meters at the start of every month to monitor consumption.
Got a very strange result this year - elec usage near doubled just in September elec gas jan 459 146 feb 423 133 mar 337 120 apr 364 134 may 307 90 jun 307 51 jul 281 42 aug 285 34 sept 545 79 oct 303 76
for no possible reason I can see. (No, immersion heater is not even connected).
Now that I have October figures, and that is back to normal, I can start seriously to worry about what happened in Sept.
Any suggestions very welcome, please! Many thanks, Lol
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It not double your January reading by any means. Keep an eye on your reading sbut best guess is you left the immersion on.
Adam
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No, it's double August - Jan should be higher due to dark and cold, Sept shouldn't. No way of switching on immersion heater even accidentally, not connected. was trying to imagine some wiring or meter fault that could mysteriously correct itself - October figure is exactly back on track from previous year. Lol
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