As rough as it is, I think you'd struggle to find regulations that this install has broken.
The steel wires are only connected at the shed end, which is bad practice, but contravenes nothing, as long as the copper equivalent csa of the number of wires connected is sufficient, which I would estimate they are. Should have sleeving on them, but that's a minor point.
At the house end, the only regulation breaches (from an English point of view) that I can see, are the single sheathed blue and brown, lack of strain relief, non fire resistant enclosures, and possible IP rating issues.