Boundary on small electric substation - wall crumbling

[Glitterbug]

I'm new to this forum.
I am in Scotland and my warranty is via Q assure.
I am still within my repair and defect period with the developer and they are coming for a visit this week to discuss snags.

Please see attached image. We have a tiny substation to the side of our back garden and the wall forms our garden boundary to the left. This substation is still in use via Scottish Power. As you can see it is a bit of a mess.

The developer had told us they "patched up and reinforced which will make it more even".
When we got here we realised that was a lie. See on the picture where the blue arrow is shows where they added new brick work that matches our development brickwork.

What I'm not happy about is that the wall seems to be crumbling in many areas and this debris that looks like powdered clay is falling off into the grass. The grass isn't growing along that boundary and is full of mounting debris. Every time it rains the wall is crumbling further. I called them and was told I know cosmetically it doesn't look great but nothing we can do.

I'm wanting to challenge them on this and have it repaired but really struggling finding info on external walls that aren't the house? Looking for some form of regulations or legislation for this that relate to the safety and structure.

Can someone point me in the right direction?

[New Home Expert]

Responsibility for this lies with the substation owners Scottish Power.
There is nothing to stop you building a wall or erecting a fence in front of this wall.
I doubt the substation wall would fall down and any new structure would protect this wall.

Write to Scottish Power and send photos and suggest options you are happy with.
Not as if they don't have lots of excess money at the moment is it?

[Glitterbug]

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.