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Andrew Green the mp who pushed through the Jersey law has a son who has a severe brain injury as a result of falling off his bike when aged 9. Green is chair of the charity Headway which does brilliant work with people with brain injury and is the main promoter of helmet laws in parliaments and assemblies across UK. http://www.theguardian.com/environment/bike-blog/2014/jul/30/jersey-compulsory-cycle-helmet-law-emotion-not-evidence
Cycle injuries only account for a small proportion of Headway clients.
If you read the background to the Jersey law I seem to remember it was pushed through by someone who had the power/influence to change the law and also had a child involved in a cycling accident with a head injury.