Helpful update in the Guardian today which references the campaign:
Liberal Democrats voted overwhelmingly against the bill at their annual party conference, and more than 500 party members have signed an online petition opposing secret courts.
Jo Shaw, a former Liberal Democrat parliamentary candidate and lawyer who is co-ordinating the online petition, said: “We are urging peers to support amendment 45, which opposes secret courts. The plans are neither liberal nor democratic and they offend the core values for Liberal Democrats.”
There’s also a very helpful article from Philippe Sands and Dinah Rose laying out the arguments against the proposals.
Even assuming the government’s factual premise to be correct, the CMP is not an answer to any conflict between the interests of justice and national security: the proposed unfairness is far greater than the one it seeks to repair.