Some might be. However basic installation work such as cables may well be done by low paid unskilled persons who just put things where they are told - or wherever they will fit in the absence of proper supervision.
Soundproofing boards or kingspan under the floor maybe i'm not too sure? I'm with john and flameport on this, I think its a combination of poor workmanship and being forced to do as they are told, I would imagine any decent electrician worth their salt would tell the designer to take a good **** to themselves, I know I would.
It's fine to be within 50mm of the floor or ceiling if the cables are loose and will move out of the way. Otherwise must be over 50 away.
The regs apply to people who care about regs though, those who don't, don't.
Have you not seen any of the recent reports in the news about new build properties with major problems and flagrant contraventions of Building Regulations?
Unless you missed an important fact such as your skirting boards run along the top of the wall, or the cables are running more than 50mm deep, or the cables in question don't come under bs7671, your installation does not comply with modern regs.
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