Outnumbered Season 3 Episode 6 (Outnumbered s03e06) airs on Thursday, May 20th 2010 at 09:30 pm via BBC One Network.
Here is summary for Outnumbered Season 3 Episode 6 :

Ben uses the stairs to recreate an assault on Everest, and chaos ensues when one of the children causes a major panic. Comedy, starring Claire Skinner and Hugh Dennis. Last in the series

Few hours after original series aired on TV, online streaming video for Outnumbered Season 3 Episode 6 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.