From this Guardian story:

The home secretary, John Reid, made clear yesterday he is prepared to declare a "state of emergency" to suspend key parts of the human rights convention if the law lords do not overturn a series of judgments that have weakened the anti-terrorist control order regime.

There is a comment on this at: http://freecommonwealth.blogspot.com/2007/05/necessity-tyrants-plea.html
concluding:

Surely Parliament won't let this happen, Surely, if necessary, people will take to the streets and defend democracy and the rule of law. We know what happens when governments take power into their own hands and away from parliament and the courts. Don't we?

John Lettice comments in the Inquirer:
http://www.theregister.co.uk/2007/05/25/control_order_flaws/.