Following on from the tax case of the BA pilot Shepherd, it is not so easy for UK national pilots and cabin crew to claim a non-residence status even where flying time outside the UK remains within the 90 day average and 182 day annual UK visit limitations.
It will be necessary to demonstrate that you have made a permanent move with your family to another country and settled there, to have a chance of your claim succeeding. Local taxation advice should also be taken in that country.
Source: -
A UK Tax Service For Non-Resident Landlords,Pilots,Aircrew,Seafarers,Non-Doms - Pilots Aircrew & Tax
My partner and I looked into this a few years back as I have a home in Spain from where we could have been resident. The downside, for me, was that I quite like the UK and the restrictions on the amount of time my partner would have been able to spend in the Uk put us off.
It's not all about money after all.. For us anyway
There are advantages to tax reduction and if you are really interested in the details, which are complex, I'm sure you could call the number at link and they would be happy to explain all.
More reading:-
http://www.taxationweb.co.uk/tax-articles/general/residence-pilot-error.html
http://www.adviserbreakthrough.co.uk/ifanews/article/82.php