I'm a qualified CAD technician in building technology sector
Not really, I worked with quite a few at my old company, maybe less in the south east, in my neck of woods I know quite a few.
As for London - a mate of mine moved there and he commanded a salary of £55K in your profession
I'm going to settle in south-west outskirts of City
Thats actually quite funny because we have masses of southeners moving to my city because the salaries are good and the standard of living it better = more for you money in a great city :)
But I suppose more cheap flights to Poland in the south