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#1 Let the parents invite the news cameras to film their beaming son being re-baptized at the nearby Christian church, and the messengering of the bill -- with required signature receipt -- to Cleric Choudary. To be followed by an in-depth interview explaining the trauma caused by the boy's conversion to Islam under fear of violence by the adult cleric and his milling gang of followers, despite the presence of television cameras.
In America I think the parents could follow up with a civil suit against Cleric Choudary and his Ahlus Sunnah Wal Jama'ah group for non-payment of costs and emotional damage, but I've no idea if British courts hear such cases.