The UKCA marking will not be recognised on the EU market. Products currently requiring a CE marking will still need a CE marking for sale in the EU from 1 January 2021.
The british government is crazy this will prevent a lot of EU manufacturers to sell on UK market.
But how do they deal with automotive testing for newly developed cars that could not be sold in the EU without technical approval.
Even medical products need a new approval!
On 1 January 2021 the UK standards will be the same in substance and with the same reference as the standards used in the EU. However, they will use the prefix ‘BS’ to indicate that they are standards adopted by the British Standards Institution as the UK’s national standards body.
Why have they not accepted the parallel CE approval.
It will rise development costs.
This reminds me of another person "Make UK great again!"

The hope that everything will come to a good end has unfortunately not been confirmed and our English friends will still feel the effects of this.
Unfortunately only after it is too late.
We hope the best for Uk people.