Britain’s new spying laws could kill people, the ex-technical director of the NSA has warned.

Pursuing a strategy of allowing spies to look in on everything that everyone says “costs lives, and has cost lives in Britain because it inundates analysts with too much data”, Bill Binney has warned UK MPs who are scrutinising the Investigatory Powers Bill.

“It is 99 per cent useless,” Mr Binney said in a letter sent to MPs. “Who wants to know everyone who has ever looked at Google or the BBC? We have known for decades that that swamps analysts.”

He said that strategy had led directly to mistakes that allowed the attacks on 9/11 to go ahead. The US had collected information from the terrorists involved in the attacks, but had not been able to check them because of resources, he claimed.

“Britain should not go further down this road and risk making the same mistakes as my country did, or they will end up perpetuating loss of life,” Mr Binney urged parliament.

He described as “absolute horses**t” the claims by government lawyers that it wouldn’t be possible to sift through data before it was collected.

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