So I did the only thing I could and took it away. Cruel I hear you say..... but weight up the facts. Bert likes to sit and watch the world go by not two feet away from where it was and the hosepipe is constantly in use for watering the garden and washing the cars. Bert would have had a field day trying to catch it, he constantly has a battle with the Wood Pigeons in the back garden. They sit on a branch a geode him till he goes for the kill then they up and away leaving him flustered and confused.
You can just see the bird leaving another mouthful of twigs. It must have taken them a good while to get it to that stage.
The next morning the whole nest was back again. Built to the same standard, so once again I had to take it away. To make sure it did not happen the next morning we fashioned a ski slope out of cardboard and fixed it to the back of the hose. They must have build another pretty near as they are often in the front garden. I caught the male of the species hopping under the back wheel of the car and thought ' oh no, not there, they can't have built there'. So we were on our hands and knees just in case. They hadn't thank goodness, he must have just hopped in out of the rain.