If the manufacturer is based outside of the UK, they must appoint a UK Responsible Person who has a registered place of business in the UK. The UK Responsible Person will take over the manufacturer’s obligations to register the device with the MHRA and will provide:
availability and updating of technical documentation upon MHRA's request,
completion of the conformity assessment,
preparation and correctness of the declaration of conformity (DoC),
provision of technical information on products and product samples upon request by MHRA.
MDR Regulator can help you with designation the UK Responsible Person.