Parts of the country, like Somerset, have been under water for weeks and the signs are they will get more rain over the coming days. There are 10 flood warnings for the south west and 29 flood alerts today.
The problem is that the ground is saturated and the boreholes are full. There is simply nowhere for the water to go other than to flood the surrounding land.
Looking at the satellite image, you can see that swirling mass of cloud that is bringing all that bad weather.