If it bothers you that much, you could ask Thames Water why he was given the bonus.
As far as the hosepipe ban is concerned, you really do need to understand where most of the water we use comes from, and how it gets there in the first place. Water companies extract most of the water we use from aquifers, and that water is replenished by rain soaking into the ground and working it's way down to the aquifers.
However, to replenish the water we need rain. Rain in the summer months doesn't do it - the ground tends to be drier so a lot of it runs off rather than being absorbed, and because it's warmer then there is a lot of evaporation as well. It is rain in the winter months which is needed to replenish the aquifers.
Now, in the last two years most of the country has had below average rainfall, which in turn means that the aquifers have not been fully replenished. And because water companies need a licence to extract the water, and have limits imposed on how much they can extract, that translates into a shortage of water in the places we get most of ours from - hence the restrictions on water use.
And as for all those green plants - they get just about all of their water from close to the surface, not from the aquifers we use.