london90210 wrote:will the fact that a UK passport has now been issued mean my naturlisation certificate in my Australian passport is no longer valid?
I believe, from the tenor of the original post, that the OP has a CoE-RoA attached to his Australian passport. The issuance of a British passport does not void a CoE-RoA, which is exactly what it says on the tin, a certificate of the right of abode in the UK. However, the rules surrounding CoE-RoA (which state that a certificate can not be issued to somebody who already has been issued a British passport) mean that when his Australian passport is next renewed, he can not get a new certificate affixed to his new Australian passport.
To summarise, you can use the Australian passport with the certificate until the passport expires, but you will not be able to transfer the certificate to the new passport. I am not certain if the new passport can be used with the old expired passport containing the CoE, but I believe that it would then be necessary to use the UK passport to enter the UK.
@milan69- You have mentioned your experiences about using ILR after naturalisation in a few threads. However, can I clarify if these experiences have been post-2012? If it is recent, do you have a BRP or an ILR vignette in your old passport?
After 2012, the UK government started destroying the biometric data of ILR holders who had become British citizens. That would void their BRP. Their ILR status would already have been subsumed by their right of abode as British citizens. Therefore, I would be very surprised if the advice quoted by you is current.