If you read the advertising on the back of a bottle of Buxton mineral water it boasts about the 5000 year journey the water has made since it fell as rain on the Limestone plateau, to be filtered by gritstone, shale, and more limestone before finally emerging in the bottling plant in Buxton to be put in bottles for our pleasure. It is a remarkable story because the water goes off after 5001 years. I know this because I bought a bottle that said consume before Nov 2008. Quite extraordinary when you think about it. Its just a race against time.