The spot brings to life a mans mental flight of fancy as he muses on what might happen if cats were to grow opposable thumbs. Having waved goodbye to its animated cow, pirate and cyclist characters, this spot kicks off a new campaign, Milk Matters, for Cravendale. Bertrum, the lead cat in the film, can also be followed on Facebook, and appears on a new website, TheMilkMatters, designed by Outside Line.   Advertising Agency: WIEDEN + KENNEDY, London.