Interesting discussion,I have my opinion and it agrees with one of the competing views
Where I see a problem is with the op
in his opening post describing the cable as
they have used a 0.75mm 3 core white flex cable.
He is extra observant or meticulous with his estimate of flexible cable size because on the one hand he asks question of regulations and on the other hand he is better than me at sizing the difference between a 1.0mm flex and 0.75mm flex in situ
Something does not seem to add up,the story does not seem to be fully disclosed,it could very well have been 1.0mm flex from the outset