UK - anti Trump petition

The UK government has a website which enables people to start petitions on different subjects. If the number of 'signatures' on the petition exceeds 100,000 the UK gov may debate the topic in Parliament. There is currently a petition entitled: Prevent Donald Trump from making a State Visit to the United Kingdom. It has over 1.2 million signatures. The petitions are supposed to only be valid for UK citizens resident in the UK. You can download a json file of the data from the site. I did a quick check on the 'signatures_by_country' field and found:

• ​over 3000 from Australia
• almost 2000 from Germany
• in fact sizeable numbers from all Western European countries including 6 from the Vatican City
• there were also 36 from Vietnam
• 22 from Cambodia
• and even 3 from the British Antarctic Survey. 

I'm sure some of the people who signed the petition were concerned UK citizens but a certain percentage were neither serious nor UK citizens resident in the UK. I wonder what percentage of the 1.2 million are 'bots'.