Agreed stuuk!! There is nothing wrong with the way it's been wired as long as all cores are connected,
I.e live neutral earth from one, ic from brown core of 2nd t&e and then earth the blue core and the remaining earth,
theres people out there that would wire it in twin and use the earth as the ic, so using two twins with all cores connected is perfectly acceptable practice!
Some people need to stop thinking they're better than others, I am a qualified spark (17th) and I say to my apprentice, I'd rather you make my ears bleed with questions than you be in any doubt over anything you do in work, just help the poor sod, and get a grip, the poor lad wants advice, not an earful!!