Thank you so much for this. We had a bit of a revelation this week after some bad wind and rain, a few large rocks have fallen down into my planters so I can't let the wee one play near there. We have also discovered the whole wall is infested with masonry bees, we've been getting bothered by them anytime we sit out. Husband used a scope camera and there is some crevices about 20cm deep into the wall absolutely infested with them. The other thing he noticed was possible asbestos as this was an old factory for years joined to the substation.
The thing that has bothered us is we feel the developer should have done something with this before we moved in. They apparently acid washed the wall as it was and build some side areas up to be more even.
My other worry now is EMF as we were told that wall was solid and would block EMF. It is literally 2.5metres from our house.
Thanks again for your help.