Over looked garden ideas

Hi, I'm writing to request some advice on what to grow or design in my garden to give me some much needed privacy. I've tried to search for this but can't find anything that addresses the problems I have. Also, i realise that some people don't agree with or understand the need for privacy and if you are one of those please don't respond as I'm feeling distressed by the situation already.
Basically, I've moved to a new build a couple of years ago and the garden which is north facing but gets a lot of sunshine due to only have my house facing it. The garden was a blank canvas with clay soil etc like most new builds but the garden backs onto what I thought were houses but are 6 flats behind. Therefore, I thought it was bedrooms overlooking me and I didn't mind as most people are in bedrooms but it turns out that it is living rooms with a balcony. To make matters worse they are social housing(no I'm not a snob) which means that the people there do not seem to work so they are leaning out the balcony smoking and looking into my garden during the day and night. They do not close their curtains and I feel as I do not have any privacy at all. It is so bad that I'm thinking of selling up and moving although the house itself is lovely inside. So I wondered if there was any advice on what I could plant or do to increase the privacy. I have attached a photo although I have removed what looks like a bush at the end but turned out to be a tree that the former owner planted but did not take properly. Thanks in advance for any ideas.

Basically, I've moved to a new build a couple of years ago and the garden which is north facing but gets a lot of sunshine due to only have my house facing it. The garden was a blank canvas with clay soil etc like most new builds but the garden backs onto what I thought were houses but are 6 flats behind. Therefore, I thought it was bedrooms overlooking me and I didn't mind as most people are in bedrooms but it turns out that it is living rooms with a balcony. To make matters worse they are social housing(no I'm not a snob) which means that the people there do not seem to work so they are leaning out the balcony smoking and looking into my garden during the day and night. They do not close their curtains and I feel as I do not have any privacy at all. It is so bad that I'm thinking of selling up and moving although the house itself is lovely inside. So I wondered if there was any advice on what I could plant or do to increase the privacy. I have attached a photo although I have removed what looks like a bush at the end but turned out to be a tree that the former owner planted but did not take properly. Thanks in advance for any ideas.

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Thanks
I like the idea of some water to add sound too.
Your pergola could be any size and shape you need and covered with climbers or not. Have a look here for some ideas - https://www.google.co.uk/search?q=pergola+design%2Bsmall+gardens&tbm=isch&source=univ&sa=X&ved=2ahUKEwiP5J202NHoAhVM1xoKHR34Cx0Q7Al6BAgKEC0&biw=1280&bih=606
You could plant a tree at the back and build the pergola/arbour on a level with the front of your shed. I wouldn't go for tall, evergreen trees as your garden would lose light and sunshine and they would suck up too much water. What you want is a smaller, airier, deciduous tree whose branches will give a filigree effect in winter when, presumably, few people will stand out on their balconies. I'd suggest a snake bark maple or a sorbus or a prunus serrulata or, if you have acid soil, maybe a liquidambar, all of which will give you plenty of interest thru the seasons.
If this suggestion offends you, please just ignore it. I'm not meaning to find fault with you.
The main thing is to look at where you would like to sit, or dine etc, and work it out from there.
Trust me - a few decent posts, concreted in, and some trellis attached makes a very effective screen even before you put any plants/climbers in
Having a nice seating/dining area will also add value, should you decide to sell. Not necessarily financially , but certainly in 'kerb appeal' as they like to call it.
Also - there are plenty of private homeowners who can be just as unpleasant as anyone else. The guy who lives across the back from me is an ar**hole of the highest order