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Just ONE terror suspect is subject to a surveillance order despite fears there are at least 2,000 in Britain, it has emerged.

Terrorism and Prevention Investigation Measures - known as PTIMs - were introduced by new Prime Minister Theresa May, billed as the most effective way to monitor potential extremists.

They replaced Control Orders which were axed after being criticised by human rights groups.

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But despite official estimates that around 2,000 people based in Britain are potential terrorists, only one person is currently subject to a PTIM order.

They allow police and security services to place an individual under curfew if they cannot be prosecuted or deported by the courts.

The figure was revealed in a statement published by Parliament before the summer recess.

(Image: Adam Gerrard / Daily Mirror)

In contrast, France put more than 400 people under house arrest following the Paris terror attacks last year.

The latest statistics have sparked fears that the anti-terror measures are not working in a time when attacks are occurring around Europe on an almost daily basis.

Lord Carlile said the Government must look at changing the law.

He told the Daily Mail: "It is surprising and worrying that we are down to just one T-Pim given the situation appertaining all over Europe.

"We know that there is a severe risk of a terror attack.

"I hope that the Government is examining the possibility of increasing the use of T-Pims or toughening them up."

A former counter terror police officers said he did not believe TPIMs are working.

Chris Phillips, the ex head of the National Counter Terrorism Security Office, said it was known two years ago that there were 2,000 individuals on the radar of the anti-terror authorities.

"How on earth you could ever monitor 2,000 people, let alone the fact that the number that we have got now has probably increased," he said.

He told the BBC Britain the only solution was to imprison all of the suspects but this was not a feasible route.