This looks interesting and I really don't what what to think https://www.bsigroup.com/en-GB/medical-devices/news-centre/enews/2019-news/urgent-brexit-implications-for-market-access---60-days-out-from-29-march-2019/ It says: The Competent Authorities advise: a) As of 30 March 2019, the UK will become a third country and the CE certificates will lose their validity. That sounds impractical because to enforce that would surely mean there can be no trade for virtually everything. Also SugarBeat is not 'placed on the market' yet so March should be interesting.
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