Like the first Para, and agree with the secondIt's all in the way you read his posts mate. He is old, so doesn't beat around the bush and just states facts.... This may come across as arrogant.
If you use BS7671 then you should have a copy. Also seeing that you are an Electrical Engineer you should know how to calculate the cable size.
If you could post up your thought and calculations on the cable size then we would be happy to review them.