Brazil Work Permit/Visa for UK citizens

English teacher? There´s a lot of that in Brazil. Arranging ahead of time in England for a VITEM V is difficult if not impossible. I would advise you to come to Brazil and present yourself at English schools. There´s no guarantee of employment but you´ll never know. That school can always ask the Ministry of Labor for a work permit (VITEM V) for you...

Here's a list of language schools teaching English in Brazil, not exhaustive, but contacting some of them may be a start:

https://www.eslbase.com/schools/brazil

As stated above, there are already a LOT of people teaching English in Brazil.  A more subtle barrier is language of instruction.   I gather from your credentials that yours is probably Received Pronunciation (RP); unlike Europe, there's a strong de facto preference here for General (North) American.  Many English-speaking Brazilians, which includes language school owners,  have some difficulty understanding RP themselves, so may be wary.  Contacting schools in advance may help.  So may contacting the British Council in Brazil, which seems to have done some research and promotion in this area.