Things are likely going to be a lot less regulated in the UK in 5 years. I'd guess that's why Google is increasing it's presence.
If you're talking about their office in King's Cross, that decision was made at least 3 years ago. It's not a consequence
Yeah I was going to put in my comment that it's likely this was decided long before Brexit, thanks for clarifying. In general though I feel that if we do start to see an increase in investment an expectation of decreased regulation is going to be the reason.