Mr. Speaker, the Prime Minister's Office has issued no directives to departments. There is no need for one, as this has been a long-standing practice across various governments.
A simple check of online archives shows that the terms “Chrétien government” and “Martin government” and similar variations appear in official government communications by various governments.
This terminology is widely used by journalists, the public and the Liberal Party itself. In fact, the official Liberal website has at least 109 references since January, 2009.