YM

Hi, I arrived in the UK in July 2021 and have became a UK resident since then. I am sure that I fulfil the conditions of case 4 of split year treatment. I have 2 questions: 1. Before arriving in the UK, I had income from my home country. Am I correct that I do not need to report it to HMRC? 2. After arriving in the UK, I still have savings in the bank account of my home country and the interests that I received was less than £50 from the day I arrived in the UK to the end of the financial year. The savings there will not be remitted to the UK. In this case, do I need to file a self-assessment? Thanks in advance!