As a German, what amazes me, it seems like many people in England are on a water flatrate, as far as I understand it. No one (?) in Germany is.
Most water companies in the UK will not allow you to start a new flat rate tarriff though (and will definitely be applying pressure to those on a flat rate to get a meter). So if you move house chances are you will get a meter installed straight away if there isn't one already.
Of course, I had lived there for 5 years, had been trying to get a visit for 1 year and hadn't changed my water usage. Still no rebate was offered!