Don't worry, Graham, they are, to quote someone, "teething troubles".
(This is satire, btw, everyone.)
Seriously, Playmobil is not the only German company (and I should imagine not the only EU country) to cease exporting to the UK. The G scale train forum I am a member of reports the same problem with German suppliers.
The problem is, and this is a factual statement not a political viewpoint, unnecessary deadlines were set which meant procedures and processes could not be worked out and discussed with those affected by them in advance.
Like you, I didn't vote for it. I even checked to see if the fact that my father had been born in Ireland would allow me to take Irish citizenship (which wouldn't have avoided these problems but would have had other benefits), but unfortunately the answer was in the negative.