Yes, I am in the Middle East.
I believe the reason for the Revenue writing was an audit of non-residency claimants, but am not 100% sure.
So my previous advice was based on the following, taken from Revenue 'RES1' leaflet:
"Tests of residence
Test 1
The first tax residence test is that an individual is regarded as resident in the State for tax purposes for any tax year in which he or she spends 183 days or more in the State.
Test 2
Where the time spent in the State in a tax year is less than 183 days, then the second test comes into play. The second tax residence test is the 280 days two-year test and involves taking account of an individual’s presence in the State, not alone in one tax year, but also in the preceding tax year. Under this test an individual is regarded as tax resident in the State for tax purposes for any year in which he or she spends a total of 280 days or more in the State in the tax year and in the immediately preceding tax year. However, this test will not apply in any year that an individual is present in the State for not more than 30 days."
So the '30 day' rule would only come into play if I had exceeded 280 days over 2 years, but had actually been resident for less than 30 days in Year 1. Then the '30 day 'rule can be applied to achieve non residency status also in Year 2.
In my case, I was resident less than 183 days in 2010 (41 days) and resident less than 280 days for 2010 & 2011 (116 days = 41 days + 75 days) days.
For 2009 I can be considered resident (251 days) but Revenue state elsewhere that you can avail of split income relief from date of departure, in my case 2009.
Anyway, thanks for your feedback, think I'll go get some more advice from a tax specialist and see where that goes.