hi there,

most uk expats will be able to save some. how much depends on your personal appetites for going out, eating out, etc

you'd have to take care of your own pension fund.

some companies provide international private health insurance that covers you whilst on annual leave and naturally on business trips.

both private and state hospitals offer good quality health care within qatar. when compared to a run of the mill UK hospital, it's almost definitely better. (but of course depends on your luck)

double taxation agreement allows you as a UK non-res not to pay UK taxes as long as you fulfill the criteria for a non-res.

NI contributions, not sure...better get some advice

you can continue watching your iPlayer using a v-p - n service like http://www.expattelly.com/?amigosid=64

good luck!