I don't think this is correct. PSTN is being ended by the end of 2025. Internet will still be delivered by VDSL (SOGEA) after that time, albeit without the PSTN service. This will still be copper pair to street cabinet DSLAM then fiber to exchange. Landline phone if required will be provided by...
Not sure what's going on in your third picture (the back of the panel showing terminals). You have bare copper exposed in the red core, a nick in the yellow. A brown and blue conductors snipped of in the terminals an left.
Please reterminate that line conductor. It looks as if it's barely under the screw, let alone under the clamp. It should be under the square metal bit which is released by the screw. Like you N conductor is.
Generally solar systems will not generate at all unless they can synchronize with the grid. This is to stop them working in a power cut and back feeding the grid. Unless you have a small scale DC battery system (the kind you would have in a camper van etc) then it is probably connected to the...
Certainly fits being a three phase mains supply, the colour's are correct. But what are those fittings on the end? I've never seen anything like that before. The way the bright metal tapers down to the fitting, could it be hoses, hydraulic or some such?
And what's wrong with that? Too many people think nowadays that profit is an evil word and no one should make a profit. Its this "own benefit of expanding the business with maximum profit" that's the reason the electrician is doing the work.