Good morning, thank you for your patience.
For most, the letter plus the deed poll (or in fact the deed poll alone) will be sufficient.
However, it's not that complicated to get a copy of the actual decree absolute, should you need it.
You'll find the instructions on how to do this here:
If you have the case number ***** date, and know the court, then it will only cost £10 to order a copy.
I hope that this answers your question?
Thank you for your enquiry today. I am happy to answer follow-up questions - please do get in touch with requests for extra information or further queries and I will do my best to help you.