http://www.economist.com/blogs/easternapproaches/2010/07/communist_subversion_britain
"Manchesters Professor Stefan Berger and Glamorgans Dr Norman LaPorte saw the documents from the East German Communist trade union federation which say that 'substantial sums of money in hard currency' were secretly transferred to the National Union of Mineworkers (NUM).
The papers also allege the German Democratic Republic provided free holidays for striking miners and their families - courtesy of the union.
The material is published in Prof Berger and Dr LaPortes new, book, Friendly Enemies: Britain and the GDR 1949 to 1990 by Berghahn Books this month."