£4bn for the global poor: the UK's 0.7%
Hi! I'm not sure if you are aware of this, but Oxfam have a network of Constituency Campaigners. Oxfam share guidance and resources, and people in constituencies around the country then lobby individual MPs. Further info here. I know they are engaging in lobbying on this specific issue. I think they could be helpful as they have experience of the style of campaigning you are hoping to engage in, may have analysis of which constituencies are best to target, and/or have useful resources/documents.