Why did it take 27 years for the CEHR to prepare a case against the BNP's recruitment policies?

Having waited that long (the BNP was formed in 1982), couldn't they have hung on for a few more months, until the law was changed in their favour. Surely it wasn't a cynical attempt to bankrupt a legitimate British political party before the forthcoming General Election. Maybe one reason is that the BNP have to be taken much more seriously now that they have two MEP's.