UK citizens returnimg to UK but no UK passport

[robgoals]

What is the best thing to do if you're a UK citizen, Australian by birth, but no UK passport and you've left the UK.
Is there any way to prove your a citizen of it comes up at passport control? Should you own up to your mistake or just re-eter on the Australian passport and hope it's ok?
Thanks

[alterhase58]

Australians are non-visa nationals for the UK - your Australian passport should get you on the plane.
Take your naturalisation certificate and show it at the UK Border. British citizens have absolute right of abode in the UK and cannot be refused entry. Passport would be easiest of course - apply as soon as you can after your return..

[secret.simon]

How did you acquire British citizenship? What prevents you from applying for a British passport before travel?

[robgoals]

How did you acquire British citizenship? What prevents you from applying for a British passport before travel?

Sorry it wasn't clear. They've already left the country using an Australian passport.

[secret.simon]

The obvious metaphor of shutting the stable doors after the horses have bolted come to mind.

Did the person have their British citizenship by naturalisation? If so, are they carrying their naturalisation certificate with them?

[robgoals]

The obvious metaphor of shutting the stable doors after the horses have bolted come to mind.

Did the person have their British citizenship by naturalisation? If so, are they carrying their naturalisation certificate with them?

Ha yes that's was more or less.my thought.
They don't have it with them but sounds like getting it posted is the best option. Thanks.

[AmazonianX]

The obvious metaphor of shutting the stable doors after the horses have bolted come to mind.

Did the person have their British citizenship by naturalisation? If so, are they carrying their naturalisation certificate with them?

Ha yes that's was more or less.my thought.
They don't have it with them but sounds like getting it posted is the best option. Thanks.

Yes, then follow first response from @alterhase58