OP
From my limited discussions with them I believe the CAT2 is dictated by the Code Breakers advice without consideration of any other factors. I am not sure whether they are even aware that the regulation referred to revolves around protection from impact rather an electrical requirement. Nor do I think they realise that reg 522.6.202 goes on to say an RCD is required unless reg 522.6.204 is applicable, i.e. cables contained in an earthed metallic enclosure which I think is the case here. At the end of the day as Telectrix stated, its the inspectors opinion that counts so looks like I will have to bite the bullet.Ask them in their opinion how this is an urgent situation.