Yes it’s wrong. Doesn’t quite work like that. This socket at work.... it’s fed by a 4 core what? Armoured, Micc, twin and earths, what? Micc it would be acceptable as the current carrying capacity is better than the above mentioned. See tables in Regs bookIs it a ring circuit? The way you would install all this is down to design. So I’m not going to tell you to condemn it as I can’t see it, lack of relevant information and also that would be down to you to make that decision.

What cable is it ? What size is the cpc ?if it’s glanded correctly then it’s fine. Copper equivalence of 3 mm on the cpc. No departure from the regs. What did it test out at for R1 R2 and Zs etc. Parallel conductors are absolutely fine.

it crops up in the wiring regulations.
What you have is conductors in parallel, as long as the load is shared equally between the paired wires, and all the wires are within the same sheath (multicore) as it sounds you have, and same diameter wires it conforms to the wiring regs.
BUT what is the earth conductor (cpc) size ? if too small in relation to the total conductor size it may not meet regs for protection.

I would suggest you get a qualified spark in to view the circuit and make the appropriate decisions based on regulations and best practice. If this is a commercial premises then just like a domestic premises, surely everyone's safety is the most important thing, so a qualified tradesman will be able to make sure this is the case.