A hiker's dramatic survival after the eruption of Mount Marapi in Indonesia has laid bare the fault lines in travel risk governance. The incident, which left several trekkers dead, is now a live grenade in the ongoing debate over regulation versus responsibility.

For the uninitiated, Mount Marapi is one of Indonesia's most active volcanoes. Its eruption last week caught dozens of hikers off guard. One British tourist, who asked not to be named, described a 'scene from a disaster film.' Ash clouds, burning rocks, and panic. But he made it out. Others did not.

The political fallout is already landing. Questions are being asked in Whitehall about the Foreign Office's travel advice. Was it clear enough? Did it downplay the risks? The Foreign Office currently advises against 'all but essential travel' to certain parts of Indonesia. But Marapi is not on that list. Critics say that is a problem.

But the real game is being played out in the corridors of power. A senior diplomatic source tells me that the FCO is 'reviewing its risk assessments for active volcanic zones.' That is diplomatic code for: 'We dropped the ball and now we are scrambling.'

The travel industry is watching closely. Tour operators who run treks up volcanoes in Indonesia are facing a reputational blackout. One insider told me that bookings have 'dropped off a cliff.' The sector is bracing for tighter regulation. The question is how tight.

On the backbenches, there is murmuring. A group of Tory MPs with constituency interests in adventure tourism are mobilising. They argue that 'over-regulation will kill small businesses.' They are drafting letters to the Transport Secretary. Expect a pushback.

But the political calculus is shifting. The Prime Minister, already bruised by a series of U-turns on policy, cannot afford a 'heartless' headline. The opposition is circling. Labour has tabled a question on 'duty of care' for adventure travellers. It is a trap the government knows it must avoid.

Polls show that the public is with the hikers. A YouGov survey this morning found that 68% of respondents believe the government should do more to warn travellers about natural disaster risks. That number is a stick to beat the government with.

Inside the FCO, there is a power struggle. The travel advice unit is under pressure from the commercial section to not 'scare off' tourists. But the consular division wants more explicit warnings. The outcome will depend on who wins the turf war.

For now, the survivor’s story is the lens through which this is being viewed. He is being hailed as a hero. But behind the scenes, the real story is about who knew what and when. And what they did about it.

The volcano is still rumbling. And so is Westminster. The next few days will determine whether this becomes a footnote or a full-blown crisis for the government's travel policy. Watch this space.