Can you cite any examples of a job that moved /from/ the EU to the UK, and which will now /move back/?
With UK out of EU, those servers need to be on EU country, unless they do some data agreement.
[0] https://www.ft.com/content/6d543d2a-eddd-11e6-ba01-119a44939...
With UK out of EU, those servers need to be on EU country, unless they do some data agreement.