Genghis Senior got fed up and went into Engineering sales instead (where, despite being allegedly retired he still seem to make more money than me on a couple of days a week) after spending 2 years designing wing sections in the Supermarine drawing office in the 1960s.
Me, I've spent time at RAE, Westlands, Britten-Norman, A&AEE, you've probably heard of most of those; I'm still on the books of one as a consultant although none are currently making a significant contribution to my mortgage. I suppose I've worked with, alongside, or at least visited the site of most aircraft manufacturers in UK and Western Europe at some point.
G