I left UK in November 2011 to work full-time overseas and thus became non-resident. I left that employent on March 31st 2018, but didn't return to the UK until end of April due to having to tie up loose ends after living so far from home etc. I was only in UK on holiday for 17 days in 2017/2018. As I entered the UK at the end of April 2018, does it mean that I was non-resident for 2017/2018, despite my employent for the overseas employer ending on March 31st? Upon my return, I stayed in UK over 6 months (I guess that means I became UK tax resident again in 2018/2019?) but didn't work and always intended to return overseas to work, which is what I have since done.
Additionally, I want to know, if indeed I was non-resident, for 2017/2018, a) is it important to claim split-year treatment for the upcoming 2018/2019 tax return seeing as I wouldn't owe any UK tax on my foreign earnings as I was non-resident for 2017/2018? and b) If I even qualify for split year treatment, would I put the date I re-entered the UK, or the date I again departed to work overseas in December 2018? or c) if I stay out of the UK until April 6th 2020, to complete a whole tax year from December 2018 to say May 2020, then it doesn't matter as I would again be non-resident again and therefore not liable to pay UK tax on my foreign earnings?
Also, as I complete annual tax returns, is it necessary for me to complete a P85 form to say I left the country to work overseas again in December 2018? What is the benefit of completing the P85 form if I already complete a tax return?
Finally, can I claim tax relief for my expenses in order to get the job: train ticket to Embassy, visa costs, document legalisation, single flight ticket to Asia, etc, which was all required to attain the job and travel overseas to begin the employment? (I found the job by myself and was not sent from UK. I didn't work in the UK for the 6 months I was back there)
I appreciate any information which can answer the many questions I have asked. Thank you.