Check if you can record goods in your own records and give HMRC the information up to 175 days later.
Update March 16, 2021:
The final date that you can use the deferred declaration scheme, including submitting supplementary declarations up to 175 days after the goods have been imported, has been changed from 30 June 2021 to 31 December 2021. The date when you will need to submit safety and security declarations for imports into Great Britain from some countries has also changed, from 1 July 2021 to 1 January 2022.
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Source gov.uk
