Joseph Gebbels

Hi, I am considering investing in UK REIT's and have a couple of questions related to their taxation. I am a non-UK tax resident living in Australia (where I am a citizen). However, I also hold UK citizenship and have previously resided in the UK. My questions are: 1. As a UK citizen I understand that I am still entitled to the personal allowance £12,570. If my Property Investment Distributions (PID's) are below this threshold is the withholding tax paid rebatable? I am aware of the UK/Australia 15% withholding tax rate, but I am wondering if (assuming the PID's is less than my personal allowance) the full amount is rebatable? 2. If this is the case is the correct means of reclaiming tax paid the submission of HMRC Form R43? Thank you,