Twelve weeks a year makes you resident in the UK and fully liable for taxes. You have to be out of the country for something like nine months during a TAX YEAR with no more than thirty days in the UK at any one time.
There is no way you are non-resident for tax purposes so do your self assessment as if you stayed in the UK all the time.
Should you be running 12/4 roster then you could get away with non-resident status by going direct to an overseas holiday from your work on one of your breaks. If you are in receipt of a military pension get a tax accountant; they will get you back more than they will cost. That includes any tax that your company may have paid.
Remember the period is only for a complete tax year. You start on April 10th and finish on 6th April you can claim zilch.
Last edited by Fareastdriver; 5th Apr 2013 at 13:21.
Reason: To cater for long term contract.