Passage: Two Weeks Notice was followed by the 2003 ensemble comedy, Love Actually, headlined by Grant as the British Prime Minister. A Christmas release by Working Title Films, the film was promoted as "the ultimate romantic comedy" and accumulated $246 million at the international box office. It marked the directorial debut of Richard Curtis, who told the New York Times that Grant adamantly tempered the characterisation of the role to make his character more authoritative and less haplessly charming than earlier Curtis incarnations. Roger Ebert claimed that "Grant has flowered into an absolutely splendid romantic comedian" and has "so much self-confidence that he plays the British prime minister as if he took the role to be a good sport." Film critic Rex Reed, on the contrary, called Grant's performance "an oversexed bachelor spin on Tony Blair" as the star "flirted with himself in the paroxysm of self-love that has become his acting style."

Question: Based on this passage, who played the prime minister in love actually?
Steam of consciousness below:
This is the relevant information: Two Weeks Notice was followed by the 2003 ensemble comedy, Love Actually, headlined by Grant as the British Prime Minister.
So, the answer is Grant.