Hi oldwelshman1961,
1. You can file online if you use 3rd party software
2.The SA100 is now available to download - it will show as reference only but you can stil use this
3. You can contact us here:
Self Assessment: general enquiries
Select the digitial option
4. We cannot comment on foreign postal delays.
5. As a non resident landlord you are required to complete a tax return irrespective of the level of rental income received.
Thank you.