Fantastic show... Its been on the BBC recently. It's kinda half written half improvised.
"Outnumbered follows the daily chaos of family life with two parents and three young children locked in an unequal contest"
Brand new unopened. £12 at Amazon (cheapest I could find on price comparison), £9 to you!
Amazon link for review etc:
Outnumbered Series 1 [DVD] [2007]: Claire Skinner, Hugh Dennis, Samantha Bond, Tyger Drew-Honey, Daniel Roche, Ramona Marquez, Andy Hamilton, Guy Jenkin: Amazon.co.uk: DVD