It is common for British and American leaders to try to show the “special relationship” between their two countries extends to them personally. When Rishi Sunak landed in San Diego for a flash visit to see Joe Biden, the world’s media were spared any such attempts verging on the grandiose. There was some light banter from Biden about Sunak’s home in California and carefully coordinated invites between the two leaders for future visits. It was a far cry from the scenes of David Cameron playing table tennis with Barack Obama, or Theresa May holding hands with Donald Trump. But when journalists were ushered out of the gym on the naval base in Point Loma, where the leaders of the three Aukus powers had gathered for a summit, the real strength of the relationship between Sunak and Biden became clear. Instead of reams of officials sitting round listening closely, the two leaders spent nearly an hour alone, preferring to have a more personal conversation. There was plenty for them to bond over, before they got into the nitty gritty. Sunak is a big college football fan, from his days as a business student at Stanford. He still has a house in Santa Monica, around three hours’ drive up the west coast. The prime minister also remains so fond of chocolate chip muffins and Mexican cola that he brought a stash of both home. Of course, Sunak is not always keen to talk publicly about his close ties to the US – particularly the green card he held until 2021 and whether he will publish his US taxes. Biden’s angling for an invite to Sunak’s California home may have left the prime minister wanting to wince. But such encounters are highly valuable. Karen Pierce, Britain’s ambassador to Washington, has made persistent requests for a bilateral meeting between the two leaders. They appear to have paid off, with the prospect of a visit by Biden to Northern Ireland in April, before Sunak returns for a longer trip to the US in June, this time to Washington DC. In between, they will meet again at the G7 summit in Japan in May. Three such meetings in as many months means hopes are not high Biden will come to the UK for the king’s coronation. There are plenty of issues requiring joint engagement by both leaders that will continue in the background. As well as fulfilling plans to give Australia a new fleet of nuclear-powered submarines and working through Britain’s concerns about the US Inflation Reduction Act, the question of how to deal with China’s growing “aggression” is a live one. It is likely to have been one of the main topics the two leaders discussed when they held talks away from prying eyes this week. Biden joined the US Senate in 1973, meaning he has been in frontline politics for longer than Sunak, 42, has been alive. There is a wealth of wisdom and experience for the prime minister to admire, especially when it comes to China. During a career keenly focused on foreign affairs, Biden is said to have spent about 100 hours speaking to President Xi Jinping. Much of that was face to face, instead of on long-distance phone calls, making Biden the western world leader with perhaps the greatest personal insight into Xi’s character. At Monday’s summit of the three Aukus powers, they agreed that the “challenge” posed by China stretched decades ahead. So for Sunak to be able to draw on reflections from Biden looking back long term may prove a helpful counterbalance to hot-headed Tory backbenchers.