Travelling as a dual citizen

I've recently become a British citizen, and now hold both a British passport and an EU passport from my home country.

I'll soon be travelling from the UK to my home country. I was hoping someone could advise me on which passport I should be showing at different stages of my journey.

I understand I should leave the UK on my British passport, but the authorities no longer check your passport when you exit the UK, so the first time I need to show my passport is at the gate when I board the plane. Should I show them my EU passport then to prove I have the right to travel to my home country?

Should I also enter my EU passport details when I check in online for the UK > EU flight?

When I arrive in my home country (EU), I'll of course use my EU passport at passport control.

For my flight back to the UK, should I check in online using my UK passport details?

In my home country, there's a proper passport control before you even get to the gates. Which passport should I show to the border force officers then? My EU passport, as I believe I'm supposed to leave my home country on my EU passport?

Then at the gate, do I then switch to my British passport to show I have the right to travel to the UK?

Thank you!

British citizens don’t need a visa to visit EU countries therefore your British passport is proof enough.

Simple rule: leave/enter UK with British passport and enter/leave EU with EU passport. You can use either passport to fill in the API.

API - Advance Passenger Information
For security reasons, the US, most EU member states, and other countries now require airlines to provide details about their passengers before they travel. This is known as Advance Passenger Information (API). (from: https://www.nidirect.gov.uk/articles/ad ... you-travel)


Not to be confused with immigration/visa requirements.