What film is this?

[Knipples]

Ok so I may well have dreamt this (literally) or I may be going stark staring mad, BUT I had a dream last night which im sure was a film, I was in this film in my dream, I hadnt replaced one of the characters, was just more observing, but its bugging me what the film was......

It was set on earth, but something had happened like a major disaster, and the police/army were now running the country, not very well because people had gone into hiding. The film was in this big farmhouse that they had set up to hide from the police, had like tunnels underneath the house, and if the police came they would go and hide under the house, they were able to turn all the electric off quickly, and had enough food to last a while.

They had a field of crops they were planning to harvest to live on a bit longer, and they had so far hidden from the police. The reason they got caught (or looked like they would) was because one of the people who lived there got dropped home by her boyfriend to the farmhouse while the police were there searching the upstairs (the people were in the tunnels under the house at the time)

Thats pretty much as far as I got before I got rudely awoken by the alarm clock, so am I going mental (er) or is this actually a film?