I think perhaps that it may have been DIY DAN having a go. I particularly liked the way all the conductors were identified, and they earthed the back box!
Ah! the universal black/2 reds blue/2 reds whatever you've got to hand/2 reds earthing system. A very much misunderstood identification method... :coat
.....mind you; have you seen how much Buy and Queue charge for green sleeve FFS!