Most of the rain falls where there aren't that many people living (eg Scotland, Cornwall)
You left out Wales and N.I - where it rains a lot. Maybe not heavily, but seemingly consistently.
Don't know about Wales, but N.I water is still on the rates (or was until recently) and with mostly sod all investment (and total lack of any effective Political leadership for decades) if it actually stops raining for any more than a few weeks, the leaky system can't retain much of a reserve.
Biting the hand that feeds IT
