My next door neighbour in BKK found out his son was dead because on the local news it showed his son lying on the road in a pool of blood with his throat cut and face beaten in. His shirt was open with multiple cuts and stabs to the chest and stomach. By all accounts the blood was still warm when the press arrived. Nice! I doubt he (my neighbour) will ever stop having the nightmares.
Sorry I have to cast a lot of doubt on this story. The pictures you describe are far too graphic to be shown on British television news. The chances of getting TV pictures back from Afghanistan and on local tv news before kniform also very unlikely. I cannot speak for other organisations, but BBC VERY mindful about releasing names and details before MOD gives the nod.