What can I do if I have sent my documents to the Home Office and they have not been returned

If you are experiencing a long delay in the return of your document, please report the issue to us so we can take it up: https://www.the3million.org.uk/report-it

It is also worth reporting to the IMA: https://ima-citizensrights.org.uk/report-a-complaint/

Also, do write to your MP for help and quote the Withdrawal Agreement paragraph 18 (1) i which states "Where the identity document is retained by the competent authorities of the host State while the application is pending, the host State shall return that document upon application without delay, before the decision on the application has been taken".