Thank you for your patience with regards to this scenario.
HMRC does not intend to update the guidance for individuals who have spent less time in the UK due to the Covid-19 pandemic.
You should self-assess in the normal way based on the actual days you have spent in the UK.
There are 3 Automatic overseas tests, 3 Automatic UK tests and the Ties test.
RDRM11040 sets out the order in which each of the tests should be applied to reach a decision on your status.
It will be up to you to work your way through the tests and self-assess accordingly.
Additionally, if you have now ceased work for your part-time UK employer and are now self-employed providing services online you should refer to RDRM11770 from which can be seen that work is considered to be done at the location where it is actually done rather than where the employment is held or the trade, profession of vocation is carried on.
So if you are in Brazil when doing your job such duties would be regarded as work done overseas.
The taxation of this income will depend on your residence status and where you perform your work.
More information regarding the taxation of different types of income depending on your residence status is available in booklet RDR1 which can be found at :
Special rules for certain occupations