This is a link to a House of Commons Library paper that deals with the Pashtun people and the current Afghanistan/Pakistan policy of the USA and the UK.
Quite a long paper but well researched and written and gives a very good primer to the history of a very troubled region where the UK has been fighting Persia/Iran and Soviet Union/Russia for 200 years.
http://www.parliament.uk/briefingpapers ... 10-045.pdf