Non resident working for a UK company from abroad and receiving on UK account - taxable?

Your question is old, and probably you already know the answer at this point, however...

You won't owe income tax in the UK, you are effectively a foreign entity, and the company is paying you for your services - it doesn't really matter that the payment goes into a UK based bank account, it's the same as if they were sending payment for services directly offshore.

You most likely WILL owe income tax in Brazil. You should be declaring the income there, and paying tax appropriately.

Your UK based bank account is a different matter, you should make sure you understand your ability to retain that account as a non-resident. You don't want them closing the account on you or taking any other similar action, if they determine that your current residential status leaves you ineligible to own/operate that account. I would limit the funds you leave in that account, if it is not your intention to return to the UK.

I would speak with an accountant and seek professional advice, someone needs to look at your specifics (payment amounts, tax thresholds, etc), to assess this specifically for you. There may also be tax implications of transferring the funds cross-border, which should be looked at. I suspect at this point you may have already sought professional advice, it might be worth a follow up post if you do have more detail to offer.