THE CLAIMS

Had 51 meetings with a Czech spy over three years in the 1960s

Leaked 87 pieces of intelligence at the height of the Cold War

Accepted gifts worth more than £12,000 in today’s money

Handed over details about Britain’s nuclear weapons programme

Revealed Nato briefing notes on the withdrawal of British troops from West Germany

Hailed as one of Czechoslovakia’s ‘most productive sources’ in UK