In the coming years, with both a changing weather system and projected changes to our climate, this thing is going to become more and more regular, with the South East likely to experience more prolonged periods of drought.
As a hydrologist, I find the potential consequences of this very interesting indeed and can see resource distribution of water becoming a huge political battleground.
There has long been talk about the need to pump water from the North of the UK to the South East, where warmer temperatures, less rainfall and depleted groundwater resources place an enormous strain on the availability/consumption rate. Obviously, we face no such issues in Scotland, where water is abundant and plentiful. It'll be interesting to see (particularly with the forthcoming rush to convince the Scottish public on a referendum on Independence) if Scotland can take strides in providing ecological trade to the south in the form of resources as well as energy.
I'm pretty confident the SNP will be looking to the Scottish Energy generating capability from renewable sources (particularly HEP, wave and wind), in conjunction with the surplus water resources we have as a strategic argument in the self-sustainability of the future of an Independent Scotland without the reliance on North Sea oil, but in the meantime, it'll be interesting to see how long we go before the UK government take action in an effort to redistribute water to the increasingly stressed south.