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Thanks for the reply Postdog . I checked later on BBC i player and found that the programme was 8 mins long but thanks to your post can see why it kept on repeating itself, seems rather stupid to me.
As regards to the story line Ann86 it showed Sam in Afghanistan attending a damaged property after a explosion. Finds a child and then his injured father who she shoots, thinking he was about to detonate a explosive device when in fact was reaching for his inhaler. Whoops. As I said it was only 8 mins long and you can find it on the iplayer.