Together Declaration (https://togetherdeclaration.org/)
Please sign the Together Declaration against "Vaccine Passports" in the UK.
"We the undersigned reject vaccine passports or any similar form of medical certification in the United Kingdom and invite you to add your voice to ours by signing this open letter. Together, we represent more than 200 organisations, business groups, campaigners and professionals who have come together because we are gravely concerned about where the introduction of vaccine passports could lead..."—Together Declaration
Please also check out their Week of Action (https://together.togetherdeclaration.org/events/) to see if there's anything you can be involved in.