I've just (very roughly) worked out that based on your reading today:- you lost 0.023 M/3 over half a day, double it and times it by 30, this gives you 1.38 M/3 over a month, at £2.50 a cubic meter it works out at £3.45 extra over the month.
You say you live in a flat, is it possible your neighbours have been out today ? Turn your stop tap off when they are in, get them to run a tap and check the meter then.
Good idea, I've turned it off for now but just noticed neighbours not in. Will leave it off just for an hour or so and see if they return or knock.
I just re-read your earlier post, is this only your second bill ? Could it not be the first one was an estimate and your playing catch up now ?
I've dug out some old bills.
The first one I get got was not metered and was £433.69 for the year.
Eventually after two similar bills I got the meter installed.
6th March: Meter installed.
24th July: First metered bill which said: Used 45m3 of water over that period, total for the bill £100.36.
20th Jan: this big bill comes through for £342.87
so it doesn't seem like I'm playing catchup, seems like the bill just rocketted due to some water getting lost somewhere.
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I'm starting to get more and more p*ssed off with this now. The water company have fobbed me off, albeit on the phone they're nice but the person who came out blamed the loft tank.
He said - the meter is still moving with the stop cock off - meaning that it's MY issue and a leak on the property itself. 5 minutes later he went off.
I got a plumber out who fixed toilet ballcock and said it was fine.
I'm tempted to just stop trying - photocopy the bills I have, write a letter of complaint and see what they say.