Not because of Brexit itself but more because of how incompetently they're handling it thus far and the implications of that:

1. No certainty that our customers will remain here or that they'll keep buying. We're seeing larger customers slow down spending.

2. No certainty that we can hire the right people from wherever we need to.

3. Little hope that the government will act in a pragmatic, pro-business manner (in fact, red-tape and the corporate tax burden is all but certain to rise for anyone who's not a large multi-national). HMRC (the tax man) are on some crusade to impose some MTD (Making Tax Digital) program and some other disasters on business, tightening up rules on the use of independent contractors, etc. This is not the government showing flexibility, this is the government going about business as usual whilst squabbling over what Brexit means and leaving the economy unattended.