Why are they having to do this and what lies behind their strategy. There should be no surprise as all businesses have t adapt and change and M&S has such history and expectation on its shoulders that it is harder for them than most. Shareholders expectations are a big driver which is where private businesses like Aldi luck out!
Go to 0130 for start http://www.bbc.co.uk/programmes/b09pjgm4
(Time limited availability as on BBC iplayer)