Global vaccine hesitancy is a key obstruction to halting the spread of coronavirus. Roughly 20% of UK adults are ‘unsure’ about vaccines and a further 8% do not want to get vaccinated at all (e.g., anti-vaxxers). This UK-Japan mixed-method study examines 1) the vaccine hesitancy rates and reasons in parents and the respective impacts on their children and 2) potential co-produced solutions for facilitating vaccine acceptance.