"Startup" in the old Silicon Valley used to mean companies with serious technology like Amiga or Apple or Illustra. The staff used to be PhDs and sometimes professors from Stanford & Berkeley EECS. "Startup" did not used to mean "3 marketing dweebs and a website".
Valley interviews used to be "Super Saturday" 6-hour exams with theory questions for junior positions. Startups had more rigorous requirements than big companies; BigCos would at least look at entry-level resumes, Startups not so much.
I have trouble believing London's Shoreditch is any kind of "Silicon Valley".