If there is no Brexit deal as of March 29, companies making any new devices that need a notified body assessment to be placed on the UK market will need to go through a conformity assessment with an EU27 notified body ̶ and NOT through a UK notified body ̶ before having the CE mark placed on them.
That is the latest position from the UK medtech regulator, the Medicines and Healthcare products Regulatory Agency (MHRA), as explained...