Apocalypse end of the world program on bbc or another channel?

[gotchaeme]

I remember it a few years ago it was just one program and its called something like what if technology stopped working and there was no police or government any more , and it follows one family as they escape the city and try and survive at one point they go to a warehouse and try and trade with some gangsters but instead they take all his stuff so he goes in the back to steal some food and his wife saves him by shooting one for them
If anyone knows
thanks!
emily

[LeMarchand]

Possibly the recent remake of "Survivors", though they weren't a family and it was after a plague. There was a warehouse in Season 1, Episode 2: http://www.imdb.com/title/tt1326101/combined