My Mum's water bill says she has used 40% more water - 32 cubic metres versus 23 - in the second half of 2012. She lives alone and has only had occasional visitors. Can a water bill really fluctuate so much? I've looked it up online and the only possible suggestion is a leak. My gut instinct is that there is no leak. Anyone had previous experience of this? Any water engineers here?
I checked the meter outside briefly and the "red hand" was not spinning when I looked.