Claim a waiver for duty on goods that you bring to Northern Ireland from Great Britain or countries outside the UK and EU.
Undertaking administrators using the Customs Duty Waiver Online Service must log in to confirm that beneficiary registration details for every business within their undertaking are correct. This information, such as a company or VAT registration number, is required for businesses to continue using the Customs Duty Waiver Scheme. If you believe your current beneficiary details are incorrect, you should contact HMRC by email at customs.duty-waivers@hmrc.gov.uk.
Source: https://www.gov.uk/guidance/claim-a-waiver-for-duty-on-goods-that-you-bring-to-northern-ireland-from-great-britain. Summarised automatically from the official source — general information, not advice.