how does one move from the US to the UK?

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Not seriously, just for play. Throw me the basics. Here's the scenario. You don't know anyone in the UK. You live in the US. You're thinking of moving to the UK - how would you do it? Would you check out any websites first? Obviously you'd need a job - would you apply online or would you fly over there to job search? What if you had to move there first and then find a job? How would you go about it?