I went today and paid our water bill after nearly messing myself when we got it 131 tl.
Once i'd calmed down i thought this can't be right there must be a leak somewhere, went outside to the meter to check knowing that all the taps were off and no water running at all and low and behold the little wheel was still spinning.
Started looking for leak and eventually made my way upstairs to the top bathroom which hasn't been used since the end of January, as soon as i walked in i could hear water running and it turned out to be the toilet in there still running.
The valve that opens when you lift the pull string was not sealing properly and was just trickling all the time as soon as i switched the cut off off the noise stopped and after a couple of minutes the draining stopped, so all i have to do now is replace the seal and the problem will be solved.
Until then it will remain OFF.
Well worth checking things like this if you get a strange higher than normal bill.
Just wish i'd heard it before but as it was the top floor we havn't been up there all winter and it wasn't a loud noise at all.