Charles David Powell was a key foreign policy advisor to British PM Margaret Thatcher. He wrote a letter to the private secretary to the Foreign Secretary Stephen Wall detailing a conversation between Margaret Thatcher and French President Mitterrand

From the letter it is clear that both Thatcher and Mitterrand were worried about German domination of Eastern Europe (including a reference to them becoming 'bad Germans').

However those leaders were isolated - they did not have support from the rest of their governments to put pressure on Germany (and Mitterrand believed that pressure would anyway not succeed). Therefore no action was taken.

The text of the letter is available here: http://news.bbc.co.uk/nol/shared/bsp/hi/pdfs/11_09_09thatcher_unification.pdf