Yahoo Movies has posted an excerpt of one of the Blu-Ray documentaries on “The Iron Lady” – creating Margaret Thatcher – in which Oscar-winner Mark Coulier talks about the process of transforming Meryl into Margaret. Lots of new footage from behind the scenes is shown. The full documentary and more featurettes can be found on the Blu-Ray, which is available in the US since April 10 and in the UK since today.