I like living on the edge.
With your level of posts on askaboutmoney you are obviously financially astute. It would be to your advantage to register for ROS. Filling in the form 11 online would not be difficult for you. I have learned a lot about the workings of the tax system from my years of ROS usage. It can be very educational. Also it seems to operate more efficiently than myaccount.
'I refer to your recent query and letter of 9th January.