I'm amazed that the sound transmission is so bad in a 1930's house. My semi-detached house was thrown up built in 1946, and I only hear my neighbours talking occasionally, when we're both in the kitchen at the same time, although when their GCs visit they play a game that seems to be based on stomping up and down the stairs and making as much noise as possible (stairs are on the outside walls).
I wonder if it would be worth speaking to them, explaining that you can hear them talking and consequently know more than they'd probably like you knowing, eg who needs a dump and when, and asking if they could try and be a little quieter, especially late at night and early in the morning.
However, this also stood out for me:
I like to read and sit in my garden and not have TV or music because it annoys me.I like bird song , nature sounds etc .
I wonder if perhaps you are more sensitive to noise than most? I know I am, and I have to make a conscious effort not to get riled by it. A neighbour's boyfriend leaves for work around 5am when he stays over, and he has the music in the car on so loud that I can hear it clearly through closed, double glazed windows. It annoyed me to start with, now I just think "Oh, he's off to work" and go back to sleep.
I'm currently being annoyed by the noise of an angle grinder which has been going on since at least 8am, but I know it's unreasonable of me, so I'm doing my best to ignore it.