That's not my experience; a lot of friends and colleagues have left the UK to go back to the EU since the referendum vote.

Also, in terms of recruitment, very few people are now interested in coming over to the UK for engineering positions. We used to have a lot of talented candidates from EU countries (especially Portugal, Spain, France, Italy, etc.); we have not had a single applicant from these countries since the vote.

Just because they're still working in the UK that doesn't mean that they haven't been affected at all.