It’s not really ‘internal’. I pulled up the petition and found that I could click on it as well. There is a block where you have to note that you are a citizen of the UK, but how they prove or disprove that....is a remarkable and humorous matter (it’s not existent). So 1,000 votes from China is a possibility...or even ten votes from Austin.
I think the new wording now is that they want the minimum to leave the EU to be set at 60-percent in favor, which they know that the leave-crowd can’t get past the 56-percentage point.
What about the 39,000 signers from Vatican City (population 500)?