union barons gave more than £ 700,000 to ed miliband 's party in a week .
overall , labour accepted more than £ 1.1 million between april 6 - april 12 .
tories received just £ 492,000 with most coming from wealthy individuals .
the lib dems , meanwhile , were given just £ 50,000 and ukip £ 8,000 .