Thanks for your question.
I am assuming your certificate of entitlement is endorsed in your expired passport. Is this correct?
There is two ways you can do this. Firstly, you can either travel with your new and old expired passports.
Secondly, you can apply for a Transfer of Conditions (TOC). For this, you will need to make an applicatioon to the home office and pay a fee. You will be able to find details of what you are required to do on the following link:
I hope this helps. If so, kindly click accept.
If you wish to discuss, please feel free to ask further questions.
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