Renault Kangoo Van starting problems when cold?

Hi, I am hoping someone may point me in the right direction before i get my pants pulled down by a garage, past couple of mornings i have noticed that it has become harder to start my deisel van being a kangoo, i replaced the battery 2 months ago so i know it cannot be this, it is turning/ power from the battery but it just seems to take around 5/6 times turning the key when cold, if someone can help me i would appreciate this very much