A second attempt
As written here the blackbird's were unsuccesful in raising young, I had thought perhaps they no longer considered the garden a viable safe place but regular watching of it & all the visitors we get I noticed them visiting the willow bush and now both Mr & Mrs visit carefully with beaks full of grubs. They land, scan the area, move in one direction, scan the area then move in another sometimes flying into a different bush first. And if you're quiet & have timed it right you can hear the chicks being fed before they fly off again to fetch more.
The willow is a much denser bush, further up the garden away from the wind that whips around the corner of the house too. Its not possible to photograph them unless disturbing the bush which is not something that will be done. So here's nice pic of their home.
well after my return from another work trip (Michigan, USA) the nest is empty and hopefully they managed to raise a family. It's a busy & often dangerous area with magpie's, crow's and the odd raptor visit!