No, because, as per the help page https://petition.parliament.uk/help, only British citizens/UK residents are eligible to vote. No point undermining a legitimate process with illegitimate entries.
So... are the ISPs instructed to record only domestic connections? Or am I being surveilled too if I happen to connect to an ip address located in the UK? Or similarly, if a UK resident happens to connect to me?
It's irrelevant really in terms of the petition, as the site is a mechanism for British citizens to bring their concerns to the attention of parliament. I assume you would have to go down a different avenue to lodge your objections.
Note that I agree with your sentiment, just that that is what the site is for!