'It is heartbreaking how the swine flu jab changed my son'
20 September 2013 Last updated at 20:44 BST
Four families have been told they can apply for government compensation over side-effects of the Pandemrix swine flu vaccine.
Studies have shown the jab increased the risk of the sleep disorder narcolepsy.
Families could be entitled to £120,000 if they can prove "severe" disability. Jon Kay reports.