Friedrich Hayek discusses Keynes and his influence on a Britain facing economic difficulties.
For Hayek's critiques of keynesianism see his book; A Tiger by the Tail: The Keynesian Legacy of Inflation which can be found in PDF at
https://sites.google.com/site/malthus0splace/home/hayek/pure-economics
The Pure Theory of Capital can be found at the same above link as Tiger by the Tail.
This is an excerpt from a longer interview which can be found here
http://www.vimeo.com/4063439