Oh my gosh thank you so much for all this advice, I am going to write all this down, with the names of everything you have suggested and start googling, will also try and find a tree merchant.
Would love to see some pictures of your gardens with names of the trees/bushes.
Ok no to bamboo and possibly consider more fruit trees too.
I currently have a beautiful cherry tree in my garden now (I think that's what it's called) beautiful pink flowers that last about a week or 2, then leaves all summer. I love it, might consider getting one of those for the new garden.
Some have asked about size of the new garden, so I have counted the fence panels, it's 10 long and 6.5 wide. So assuming the panels are 6ft, new garden must be 60 ft X 45ft ish.
So you think some taller trees and then break it up with more bush type structures between? I love the look of the trees/bushes changing over the seasons, apart from winter, what I seem to have now is a beautiful leafy garden and come winter I just have sticks everywhere! I think I picked wrong in this garden, Acers and trees I no longer know the names of, (might photograph them as you may know what they are).
But if I go more bushy, how do I block out the houses I will see at the bottom of my garden without some tall trees? I really want to be in my garden and see nature, I feel like I want to be surrounded by trees and bushes, I want to see greens and purples and colour. Not Bob opposites, washing line......