If you are interested in National or even International campaigns there are loads of organisations you can get involved with. Here are some but if you google what your subject interest is you’re bound to find something!
NSPCC - Campaigning for children’s rights
Cancer Research - Cancer Campaigns is about our supporters, staff and scientists working to create the right political environment to beat cancer
Age UK - Campaigning for older people’s rights
Queer Youth Network - Campaigning for Lesbian, Gay, Bi-sexual and Transgender Youth
Amnesty International - Campaigning for Human rights
Hallam also has an Amnesty International society
Green Peace - Campaigning on environmental issues
UNICEF - Campaigning for childeren’s rights
World Aids Campaign - Campaigning for the rights of people who have HIV and AIDS and to further the medical advances in this area