Nuclear submarines, Gaza and Ukraine are likely to top Anthony Albanese's agenda as he touches down in London for the next leg of his three-country visit.

The prime minister arrived in London around 6.30am Friday (AEST) ahead of a meeting with UK Prime Minister Keir Starmer, with an expert suggesting the AUKUS deal would dominate discussions.

Under the multibillion-dollar security pact with the US and UK, Australia would gain nuclear-powered attack submarines by the early 2040s.

The US is reviewing the agreement, agreed under Joe Biden's presidency, to ensure it aligns with President Donald Trump's "America First" agenda.

Mr Trump would be a key topic of discussions, Monash-Warwick Alliance international relations researcher Tom Howe said.

"I think (Mr Albanese and Mr Starmer) will pr

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