LIB DEM peer Lord Carlile called on PM David Cameron yesterday to bolster Britain’s draconian anti-terror powers in response to the alleged involvement of a British national in the killing of US journalist James Foley.

The freelancer was decapitated in a filmed execution by a man thought to be a British member of the extremist group Islamic State (Isis).

Hundreds of Britons are believed to have travelled to the region to fight, among them the man known as “John” from London who apparently carried out the on-screen beheading.

The Prime Minister has insisted that the authorities are working hard to track down those who have come into contact with Isis.

But Mr Carlile, former independent reviewer of terrorism legislation, said the decision to scrap the control order system in favour of more limited terrorism prevention and investigation measures (Tpims) should be revisited.

“I do think the government could make a legislative response to the current problem by reintroducing control orders, or beefed-up Tpims, as they are called, to ensure that people who are identified by solid intelligence as presenting this kind of risk can be placed under controls which can prevent them activating their ideas,” he said.

“I think that we can demonstrate that, certainly in the last six or seven years of control orders, they were very effective, including a provision that allowed certain people — if a judge agreed, a very senior judge — to be relocated.”

Lord Carlile also backed the revival of the Communications Data Bill — described by critics as a “snooper’s charter” — which failed to gain enough support to become law. It proposed giving police and security services access to communications metadata such as the time and location of mobile phone calls.