Their chances of proving this took a serious knock last week when legal aid was withdrawn. The parents will now have to fund their own legal challenges if they are to be heard next year in court. As legal fees for the group already stand at £10m, it's likely that some of the parents may have to pull out.
It would be interesting to discover who decided to withdraw public funding for their campaign. As a result, the public may never hear about the sort of MMR reactions that dwarf autism.