Many years ago when I was young and stupid (as opposed to now, when I am old and stupid) I used to brew my own ale. Having heard that Burton ales were so good because of their water, I decided to take a trip to Burton with some large plasic containers and a length of hosepipe to grab a few gallons of the precious stuff and make some good brew.
The only place I could find to get my water was a public toilet, but never mind - it was still the stuff I wanted. Having stolen some 15 gallons of water I went off home to start my brew. I was horribly dissapointed to find in the end that it tasted exactly the same as the stuff I usually made.
It turns out that the water I stole was exactly the same as my home tap water, the stuff that Bass and Marstons use comes from their own bore holes - not a Welsh reservoir like the tap water that we all drink.