Recently Gained British Citizenship > Has Filipino Passport > Wants to Travel….

[Terpe]

The name on the British Naturalisation certificate in her married name. Her Filipino passport shows her maiden name, the BRP also shows her maiden name.

British passport is not possible just yet.

Regarding telling anyone, she's told her friends and work mates and of course she's posted it on FaceBook.

I'm worried that when she returns and goes through UK Immigration, they may be a marker against her BRP / Passport.

Why would there be a marker against her BRP ??? she's done nothing wrong and she's legally a British Citizen. There's nothing to be concerned about on that aspect at all.

Her Filipino passport is still valid. Means she can still use it.
The word is "Technically" she's no longer eligible. But who will know if she doesn't inform the Philippine Embassy.

I read somewhere that the Philippine embassy issue a letter / certificate stating that a person is not a Filipino citizen any longer and the UK Passport Office accepts this letter. Any thoughts on this?

How on earth would the Philippine Embassy have any information or idea that she is no longer a Filipino Citizen ? Who would tell them ? How could they possibly know.

That's just not at all true.

It may be easier to go through the proper procedure and change the Filipino passport to the married name and then apply for a Brit passport. ???????

That's a personal choice.
You already know that your wife needs to book an appointment at the Embassy for her citizenship retention Oath Taking.
The Embassy will cancel her old passport immediately. She'll need to apply for a new passport in her married name. Takes between 12-18 weeks.

She'll need to do that in order to secure a British Passport.