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This question was prompted by a programme I was watching on catch-up last night, 'A Very British Hotel' (http://www.channel4.com/programmes/a-very-british-hotel)
It centres on the Mandarin Oriental Hyde Park hotel, where 80% of the staff are from abroad (although the programme didn't say how many of them were from the EU).
I've noticed that the catering and hospitality industry (in London) is overwhelmingly staffed by Eastern Europeans, and it got me thinking about Brexit.
If we go for 'hard Brexit', it's going to have massive ramifications on these industries (as well as construction, and home services).
It suddenly makes everything a little bit more complicated...and yes, I agree with TTT here, there needs to be a very carefully thought-out set of agreements to ensure that Brits living in Europe aren't adversely affected by this (same with EU citizens in the UK).