Hi Farmfan. Firstly it's a good career choice. It's a v competitive area, though, so be prepared for the fact that a lot of people will be chasing not that many jobs.
Those companies you mention offer good careers and are great to get on your CV. What employers will look for, I'd suggest (in no particular order), are: practical experience, common sense, academic qualifications and a positive hard-working attitude.
As Matty S says - try contacting people. You've got nothing to lose. And even if they say No, send them a nice response. You never know - they might have another job going in a few months' time!
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