With the petition for revoking Article 50 nearing 4 million signatures now, there has been every reason under the sun why Leave supporters say it's invalid. So what's the truth of what can and can't be taken from these Brexit petitions to Parliament?https://twitter.com/Philmoorhouse76BBC Article: https://www.bbc.co.uk/news/technology-47668946Petition: https://petition.parliament.uk/petitions/241584