How do no claims discounts on car insurance work?

In 2005 I had 5yr no claims, later that year I moved abroad and have travelled around Europe for past 15 months, I just bought a newish car and have been shopping around for best Insurance deals, my problem is, do I still have my 5 yr no claims even though I havent had a car or insurance for almost 2 yrs? Or do you have to start back with 0 no claims? Help! please