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sound proofing
Others will know much more about sound @freddo maybe(?), but to me that whole area looks like a bit of an echo chamber and a nightmare for amplifying sound. So another +1 to getting plenty of plants to break up the noise.
I've got a deutzia (I think) which is great for that sort of thing. It's nice and green, can grow big, and has pretty pink flowers in spring.
I'd also get a couple of decent rambling roses from David Austin and put them on trellis at the top of that wood fence.
Lastly I'd consider if there is anything you could do to stop sound bouncing back off the big wall at the end. Maybe a pergola, or screening off the last 1/3 of the garden so there's a sort of top terrace.
hugo7-
It's a total echo chamber plus it's a new build so we're all in exactly the same gardens with no trees/bushes etc.
Good shout on the rose trellis, I reckon that would really help and add a bit of privacy too.
Also like @almac68 suggestion of a water feature. Would be cool to have water running down the back wall
birofunk
Looking for ways of getting some sound proofing into our garden (I can hear every word of neighbours conversations two doors down)