Relations between British and German spy chiefs have hit rock bottom because London says its counterparts in Berlin cannot be trusted to keep secrets.

At a time of escalating Islamic terror threats across Europe, Germany’s spy agency BND is being frozen out by GCHQ and the National Security Agency in the US.

Both London and Washington believe insecure German data servers have contributed to the leaking of tens of thousands of classified documents to Wikileaks.

And they have infuriated Berlin by refusing to hand over secret intelligence data demanded by left wing and Green politicians which they fear will be aired in the German parliament.

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At a time of escalating Islamic terror threats across Europe, Germany’s spy agency BND is being frozen out by GCHQ (base pictured)

It is claimed in Germany that a tranche of 500,000 sides of files put out by Wikileaks this month were GCHQ documents on covert mobile phone policy for British intelligence agents dated June 2010 and classified as secret.

They believe that the documents, once shared with Germany, were transferred to hackers - possibly Russian - who then fed them to the whistleblowing group.

Also listed as top secret was a briefing paper for attendees at a pre-G20 meeting held in London between September 2 and 5 2009 in which Turkey’s role in Europe was on the agenda.

It is understood that in November 2014 there was a meeting in Berlin between Sir Simon McDonald, the then British ambassador to Germany, together with Patrick McGuinness, Deputy National Security Adviser for Intelligence, Security, and Resilience at the Cabinet Office, and high security officials in Angela Merkel’s government.

In November 2014 there was a meeting in Berlin between Sir Simon McDonald, the then-British ambassador to Germany, and high security officials in Angela Merkel’s government

The British made it plain at the meeting that co-operation between Britain and Germany was becoming increasingly problematic because of leaks.

A source familiar with the meeting said: ‘They stressed that a secret service is just that and that its workings and operations must remain secret and they felt that Germany was leaking them like a sieve.

Britain told the Germans that the freeze on information would not only apply to MI6 and GCHQ but also to the Metropolitan Police, the Serious Organised Crime Agency (SOCA) and the UK Border Force.

The source said: ‘It has now reached the point where there is virtual radio silence between the two biggest and most important intelligence services of the western world and the BND of Germany.

‘Germany is worried because it needs the umbrella protection of these agencies. It is virtually blind without it.’

Another crisis meeting was held in Berlin in February last year to discuss the biggest rift between secret services since the end of the Second World War. It failed to placate the British and the Americans.

High-grade information on jihadists, their movements and terror plans as discovered by London and Washington and directly involving Germany, are no longer being passed on as a matter of routine.

The upheaval has been caused in part by left-wing and green politicians still fuming over the spying activities carried out in Germany by America’s National Security Agency, which involved the eavesdropping on Mrs Merkel’s personal mobile telephone.

The German government requested Britain to release details of the secret operations to a committee probing the NSA and other foreign spy agency activities in the country.

The move was forced by politicians of the hard-left Die Linke and the environmentalist Green parties.

Left-wing and green politicians are still fuming over the spying activities carried out by the National Security Agency, including eavesdropping on Mrs Merkel’s personal mobile

Both the UK and America refused to send any of the requested files to Germany. Included among them was a demand for information about a 2013 operation handled by both countries - and in co-operation with the BND - which was, and remains, top secret but was known to involve a massive surveillance programme on suspected Islamic terrorists across Europe.

Britain fears a ‘big debate’ in the German parliament which would lay open secret sources and intelligence gathering techniques.