http://www.theguardian.com/society/2013/sep/19/swine-flu-vaccine-narcolepsy-uk
What a relief to know that:
..
The condition is a rare but serious neurological disorder that affects about 31,000 people in Britain. The condition can cause massive sleep disruption. The worst hit are often young people who face enormous learning difficulties at school and university. The disorder can destroy self-esteem, and bullying is common. Adults can lose their jobs, their driving licences, and can have difficulties with relationships. Some narcoleptics have another condition called cataplexy, a total loss of muscle control.
The government U-turn follows a major study of four- to 18-year-olds by the Health Protection Agency which found that around one in every 55,000 jabs was associated with narcolepsy...
...Narcolepsy is a complex disease and its causes are not yet fully understood but it is generally considered to be associated with genetic and environmental factors, including infections.
What a relief to know that:
the drug company had an indemnity clause in its contract to provide the vaccine which means government will ultimately foot the bill.