Oh right, sorry, wrong reservoirs.
We had a very dry winter in the S and E last year and a dry (albeit not very sunny) summer, plus another dry winter. We have had enough rain here to top up our local ponds but that is quite different to topping up big reservoirs and ground water sources, which are more common in S and E. Because there are no mountains. So under water aquifers quite important.
There is no where for them to get more water from. They have been toiling away for years to reduce leakage - but demand tends to keep on climbing (more washing machines, more power showers, more industry and more housing etc etc)
I think they need to be putting hosepipe bans in place right now. And warning farmers that there is not going to be enough water to irrigate crops - so be careful what they plant.