The UK is at risk of running low on water. Why?

The water seems to have got harder over the 6-12months I've noticed scale building up more frequently and in places never previously seen, so I wouldnt be surprised to see a rise in calcium related illnesses.

The water hardness has got so bad we now just buy deionised water for the kettle and are currently looking to purchase water filters to make the water as close to deionised water as possible, because having a relaxing soak in the bath has gone even though the medical experts claim ions cant be absorbed through the skin.