Tax matters for Retired Officers are dealt with by the Cardiff Office of HMRC, because of this it is not possible for Retired Officers to register for online Tax matters.
The contact number is 03000 534 730
The Office is open Monday to Friday 8.30 am to 5.00 pm
The contact address is:-
HMRC
Public Departments 1
6 Central Square
Cardiff
CF10 1XT