Unit 3: Sources of cost push inflation

This chart from tutor2u shows the rising cost of imported raw materials and food into the UK

http://www.tutor2u.net/blog/files/Chart_of_the_Day_(Import_Prices).ppt#257,2,Slide 2

a) How might the depreciation of the £ have led to these rises?
b) Using an AD/AS diagram, explain how these rises may lead to cost push inflation
c) Assuming no change in AD, explain the consequences for the UK economy of a rise in inflation interms of the other macroeconomic objectives