As an aside, I still think there is a right way and wrong way to wire a plug... or perhaps, a right way and a more right way to wire a plug. My grandpa taught me to have a long earth cable inside the plug (even double back on itself in some cases) so if the cable grip failed and the cable was pulled, the earth cable would most likely always stay on it's pin. Plugs that have the wire cut to length exactly, in the right situation, could have the cable pulled enough to release the earth but not the live and neutral.
It's something that I've never seen proactively taught, but it something that I've carried on doing since I was taught.
It's neither here or there now because the safety bods push for molded prewired plugs.