It is simply the logical outcome of applying A50. If you are not a citizen of a member state of the EU/EEA/CH and your not a citizen of country that has visa free travel in the Schengen area and your not a permanent resident of a Schengen state, you need a visa.

There seems to be a lot of this kind of stuff out there. A friend of mine in Ireland is a building contractor who does a lot of public works, his contracts require him to use components sourced in the EU/EEA/CH, so what is he supposed with UK components in stock if there is no deal - toss them or what?

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"There is no passion to be found playing small - in settling for a life that is less than the one you are capable of living." - Nelson Mandela