Hey David, thanks for the reply. I have just completed the 18th edition last week, did the 3 day course and it was great, am currently living in the West Midlands but am thinking of working in London or another city once I get an ecs card as I don’t want to pay for car insurance at the moment, earthing and testing on ring circuits seam to be afair bit different as well as cable colours and b type CB’s but am going to study, I will look up guidance note 3 now , cheers 
