Brigi Mackenzie-Shaw

Hi, I would like to ask about tax implications, for working remotely abroad. Context: I have got permission from my employer to temporarily work from the EU (Hungary). I plan to relocate for a duration of 12 months, but only will work for the first 6 months. The second 6 months I will take unpaid leave (no income from the UK or from Hungary) My questions are, will I be a UK tax resident, if i work less than 183 days abroad? If not, what paperwork do i need to prepare? Can you please advise what does my UK employer need to do regarding taxation, and NI? For information, Hungary does have a double taxation agreement with the UK to avoid getting taxed twice. Thank you for your advice in advance.