I live in the UK but have dual nationality. What will be the impact of Deed Poll on my passports? - UK Deed Poll Office

I live in the UK but have dual nationality. What will be the impact of Deed Poll on my passports?

A deed poll issued by our office can guarantee you to obtain a new British passport. However, we cannot guarantee that you will be able to obtain the passport of the other country as well. You might want to check out the procedures accepted by the respective countries. Few countries like British Commonwealth may accept the deed poll issued by us. However, countries like Italy have a different procedure and will require you to follow a different process.