Inland revenue employee sitting for F6 taxation. wow!

I am working with the IRS in my country. Problem is.. I MIGHT be moving to UK. im thinking whether to sit for my country variant (i am really on an advantage here…I THINK..hehe!) i saw the questions…and its exactly what we had before. And its what i do. But should i sit for UK variant instead? cos i MIGHT be moving there n look for a job in accounting of cos. what do u guys think? Appreciate ur feedback. Thank u in advance.