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The letter will help. Due to a tourist visa, PF will require a confirmation from the hotel, or they call the person.
With the letter, they may not call. Have person's name address and phone #.

I would honestly be surprised if they even check all of those details at immigration control. Although I now live in Brazil, in all the years that I have travelled here, I have not once been asked for proof of funds, hotel reservation, authorisation etc. (although it certainly won't hurt to have it).
You are right in saying that you don't need to apply for a visa. UK citizens can enter for a period of 90 days without obtaining a tourist visa first.
Enjoy your stay!

Thanks for the reply! And yes, it's more the fact that I am a minor travelling alone into Brazil. It's possible that they may ask me for more documents for this reason. Well, i'll get everything they could ask me for, better safe than sorry!

Thanks for the reply I'll get this letter, better safe than sorry!

Joe WMJ wrote:

Thanks for the reply I'll get this letter, better safe than sorry!

Good plan.

In dealing with Brazilian officialdom, it's generally better to have documents and not need them, than to need them and not have them.   

May the God mercy on us, since Adham and the Eve(peace be upon him) decended to earth, the human being in continuous immigration and stranded.

Joe WMJ wrote:

Thanks for the reply I'll get this letter, better safe than sorry!

Will you be 18 in July?
Just thinking.
British nationals under 18 entering or transiting through Brazil without their parents or legal guardian, or traveling with one parent only, are advised to bring a letter of authorization to travel from any parent(s) not traveling.

Hi,

I?m staying a month in Brazil, between Mid July and Mid August, and I turn 18 in September. I already have a form notarized in the UK with my mother?s signature and have an appointment booked at a notary public in Spain for my fathers signature, as he lives there.

I am travelling alone, neither of my parents or guardians are travelling as I am meeting and staying with someone I know in Brazil, who is a resident

You are set. Good luck.

Thanks for the responses

Enjoy! I have to ask though, what program is sending people here during a pandemic out of curiosity?

Should have no problem going, I will travel to Spain first, and then brazil. Spoke to all the consulates and airlines who have said all I need is the health declaration and negative PCR test to enter the country, as inbound Brazil flights have no restrictions