LONDON – In just a few days, new Prime Minister David Cameron has openly declared Britain is no more than the “junior partner” of the U.S.; irritated Israelis by calling Gaza a prison camp; and enraged Pakistanis by suggesting their country exports terrorism.

So what is the game plan of Britain’s youngest prime minister in nearly 200 years?

Is it youthful inexperience, or is the 43-year-old calculating a new chapter in British diplomacy – casting himself as a truth-teller distinct from his Labour predecessors, whom he has accused of relying on spin?

“It’s an immature reaction from an immature politician,” Pakistan’s High Commissioner Wajid Shamsul Hasan told The Associated Press on Thursday after Cameron criticized the country’s counterterrorism efforts during a visit to India, Pakistan’s nuclear rival. “He should choose his words more carefully.”

Cameron says he will continue the plain diplomatic talk – a contrast to the political waffling of former Prime Minister Gordon Brown and Tony Blair’s accused sycophancy with his U.S. counterparts.

Cameron’s attitude bears a striking similarity to Iron Lady Margaret Thatcher, who made a virtue of upsetting her European counterparts and once famously told one of her lawmakers “your spine does not reach your brain” after a dispute over a key parliamentary vote.

“I believe in speaking clearly and plainly about these matters,” Cameron said Thursday, wrapping up his trip to India.

Countered ex-Foreign Secretary David Miliband: “There’s a difference between being a straight talker and a loudmouth.”

During his first official visit to the United States this month – at a time when Americans were seething over the BP oil spill – Cameron tried to dilute the political scope of the disaster but also spoke of the company’s importance and refused to authorize an inquiry into its links with Libya, enraging U.S. senators.

On a trip to Turkey this week, he sharply criticized Israel’s raid on a Gaza-bound flotilla that killed nine Turkish activists, adding that the Palestinian territory “cannot and must not be allowed to remain a prison camp.”

Unlike his Labour predecessors, Cameron made no mention of Israel’s security concerns or the Islamic militant Hamas, which has fired rockets into southern Israel from Gaza.

At home, Cameron angered some voters by asserting that Britain was the junior partner in the World War II fight against Germany in 1940 – a point when the U.S. had not even entered the war.

The gaffe angered British veterans, but also hearkened back to Blair, who was caricatured as George W. Bush’s poodle for agreeing to join the U.S.-led war in Iraq.

The most politically divisive comments, however, were aimed at Pakistan during Cameron’s visit to rival India – just a week before Pakistani President Asif Ali Zardari comes to Britain.

“We should be very, very clear with Pakistan that we want to see a strong, stable and democratic Pakistan,” he said. “But we cannot tolerate in any sense the idea that this country is allowed to look both ways and is able, in any way, to promote the export of terror, whether to India, whether to Afghanistan or to anywhere else in the world.”

Pakistan has faced U.S. pressure to take tougher action against the Haqqani network, the al-Qaida linked group that directs operations against U.S. and coalition forces in Afghanistan from safe havens in Pakistan.

While Hasan, the Pakistani high commissioner, conceded more could be done to battle terrorism, he said Cameron risked undermining the vital partnership between Pakistani and British intelligence.