If you're already naturalised and have submitted your first passport application, then I think your suggestion would work. In the worse case, if your passport were to get lost along the way, you'd be entitled to assistance from the British Embassy in Spain since you're a UK citizen. If you're still...

I am applying for british naturalization. so I am afraid what I would do if they call me while waiting for my first UK passport, specially now that the passport office is on strike. What exactly are you applying for? Applying for British citizen and applying for a passport are two separate processe...

Firstly thank you everyone for the time and knownledge you have invested in this forum. I am originally from Spain and I am applying for british naturalization. I have ILR due to EUSS currently associated to my Spanish passport and my Spanish National ID card. One of my relatives in Spain is not wel...