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I agree and will probably call an electrician to sort this properly, thanks all for the advice.

Forget the blue. This was just needed for this specific smart switch and I added that one myself. The old dimmer had yellow+red in one terminal, and another single red (I assume this is the load) in another terminal. I did the same for the smart switch and it works. Then there is the...

The yellow cables is currently connected with 2 red cables in the block, not just one. I thought of doing what you said, but then I'm left with 2 loose red cables not connected anywhere which I have no clue where they go. And also, the dimmer switch has 2 more red cables. One must be the bulb...

Well, I don't think I'd have a problem if that block wasn't there tbh. I still can't understand why 5 red cables would need to be together.

Here are some extra pics. I do have a multimeter. I connected the new switch and works perfect. I'm just annoyed with how much it sticks out. I don't even have screws that long to fix it, so atm it's just hanging. Honestly I would like to understand what are all the cables because it's...

Not an expert, but other lights I connected had blue and brown. Plus I'm colorblind. :D And sockets too. Just not everything red. There's no way to know which cable comes from the bulb and which one doesn't. Anyway, I managed to connect the smart switch and is working perfect. Now I just...

60s. It most probably doesn't have an earth in the conduit. We even found one socket without an earth (luckily just one). I added it myself in the conduit before the plastering happened. It's the same with this switch. All other ones have earth, but this specific one had some messy work done...

The back box is attached to a conduit and I'm not handy enough to detach that. Plus, I don't have any tool for chasing. Plus with the cables there, not sure how to detach the box.

No there isn't in this specific box. Other switches around the house have it though, and are colour coded too.

Super useful, thanks. This back box is a mess, starting by not being colour coded and not having an earth. The previous owner surely messed with this I since I have no clue what's there, I'm pretty sure it could be cleaned up. But wanted to seek more advice.

I don't own a multi-tool and honestly don't want to spend any more money on it. Can you tell me what to do with the yellow wire though? With that I can at least proceed to connect the new switch and stop the old buzzing.

We just got the walls painted, so tbh there's no chance to do that at this point. As I said If I really cannot do anything else I will just 3D print a spacer large enough to allow it. But can't I just remove the choc block and leave the open cables taped independently? Also, what I'm really...

Yeah, I'm aware of them. But the smart switch doesn't have a standard face plate, hence 3D printing my own. And as I said too, a single of those still won't get me enough space. That joint is bulky, and the switch is too. Please help me with the questions.

This backbox in my lounge has an old dimmer switch with a metal plate. Since it has no earth I was recommended to replace it, plus I want to use smart switches all around anyway. I got my new smart switch (no neutral) but it's quite thick and there's a lot in this back box. This back box has...