Hi Jean95, don't know if this will help or not. Don't know how long you've been in Oz, but we've just returned from a two year secondment.
We obtained proof of no claims discount (NCD) from our motor vehicle insurers before we left, but drove on company insurance all the time we were in Perth. We returned to the UK after about 22 months, when we went to take out motor insurance on new vehicles with our old insurer, we were told that our proof of NCD with them was still valid, as there was a two year limit on this.
Possibly what you are looking for is proof of NCD from your time in Oz, as proof for your new motor insurer when you return to the UK. Best wishes with your re-location.