Hi,
You can get relief from customs charges due on personal belongings and other goods, when transferring your place of residence to Great Britain (England, Scotland and Wales) or Northern Ireland from outside the EU:
Transfer of residence to the UK
If you’ve been charged import duties but believe you were eligible to claim transfer of residence relief, you can still apply for the relief.
If the relief is granted and you or an agent made a full declaration using the Customs Declaration Service (CDS), you can complete form C285. The form will enable you to have the import duties repaid. Find more information on repayment of duty and tax, and form C285 in How to apply for a repayment of import duty and VAT if you’ve overpaid.
https://www.gov.uk/guidance/how-to-apply-for-a-repayment-of-import-duty-and-vat-if-youve-overpaid-c285
Thank you.