Britain’s security services will be conducting a major review of intelligence that may have been compromised after a former German spy chief was arrested on suspicion of espionage, experts have told The i Paper. August Hanning, 80, who was head of Germany’s Federal Intelligence Service (BND) from 1998 to 2005, is accused of illegally collecting thousands of classified documents and using them in analysis for a foreign spy service. German newspaper Süddeutsche Zeitung has said the information taken includes “highly sensitive situation assessments, classified material from foreign partner agencies” as well as papers on Iran’s nuclear programme and the Russian…