I can only speak for those I've had contact with, but I believe it's a representative sample. It is across my industry and it is in the regions where we have factories.
Most businesses of this size are owner managed. That means they don't jump ship at the first sign of losses like a large corporate can. Most of these people have invested their working lives into these businesses and many a lot more (life's savings, charges on their own properties, etc.). So they'll take a loss this year and probably next too. They'll put some more of their kids' university funds down or increase the mortgage on their house because it's not just an investment, it's where they (as people late on in their careers who really don't want to be on the job mark) take their salaries - most of them 5 figure ones too.
And they'll continue to do this and continue to hope that someone in government sees sense because that's the only option they have. They don't have access to £300k of CAPEX like we did to negate these increases, they don't have profitable overseas arms that can finance the up front losses. These are small business owners with their entire lives in their companies and it's what makes up most of this country.
So you won't see the effect in employment figures this year, you probably won't see it next, but without a sensible government it is a time bomb that will go off in the life of the next parliament. One interesting figure is the YouGov brexit survey that I'm always being asked to take. It's one of those surveys where you know the intention just from reading the questions. They ask about revenues and profits between this year and last - mainly centred around Brexit. Profits for most SMEs are down and the automatic answer (and the one they're looking for) is that Brexit has caused it - that's not what I'm seeing. For most of the SMEs, profits are down but revenues are actually up - in part due to weaker Sterling, and these losses (or reduced profits) are all in the margins - there's a slight increase in import costs but a massive increase in labour.
Now I know as well as anyone that the plural of anecdote is not evidence, but to my knowledge you won't find this evidence anywhere. We're members of a number of industry bodies, and I see a lot of local businesses (in two parts of the country) through MP lunches, council committees, etc. This is a real effect and it's going to cause a massive surge in unemployment unless a government gets on top of it.