Treasury Grade Interview Series with Professor Jagjit Chadha (pt. 1)

Inside the Treasury’s marketplace of ideas; Professor Jagjit Chadha on how HM Treasury absorbs external analysis and why influence is a repeated game.

HM Treasury is one of the most influential, and often most opaque, institutions in British policymaking. To get under the bonnet of how it actually works, Bradshaw Advisory has launched the Treasury Grade interview series, speaking with economists, former officials, and others who have engaged closely with the department about how ideas really move through the building and how decisions actually get made.

In our first conversation, we spoke with Prof. Jagjit Chadha of the University of Cambridge, formerly Director of the National Institute of Economic and Social Research, whose career has spanned academia, the Bank of England, and some of the UK’s leading economic policy institutions. Our discussion ranged widely, from fiscal sustainability to infrastructure investment and the changing structure of economic policymaking.

One theme stood out in particular: how the Treasury processes external ideas.

Chadha argues that the department is extremely effective at absorbing analysis from outside, but far less inclined to debate it openly.

“The Treasury is remarkably good at hoovering up information and opinions from the marketplace, from academia through to think tanks, consultancies and the media.”

For businesses and organisations engaging with HM Treasury, that dynamic has an important implication. If further debate rarely happens and feedback is limited, influence tends to depend less on single interventions and more on reputation, persistence, and presenting ideas in ways that reflect the Treasury’s own analytical priorities.

Or, as Prof. Chadha puts it:

“It’s a repeated game involving reputation.”

The missing debate

In many other policy environments, economic arguments are stress-tested through open debate.

Prof. Chadha contrasts the Treasury’s culture with the one he encounters in academia:

“When I give a seminar in academia, nearly every point is challenged. That’s part of the process.”

For him, this kind of exchange is how ideas improve.

“I’m a firm believer that it’s through debate and discussion that we learn more.”

By comparison, Treasury thinking can appear more closed.

Without that iterative back-and-forth, ideas might be absorbed internally and consolidated into what Chadha calls the “Treasury view” - a position that may reflect extensive internal analysis, but which emerges largely behind closed doors.

A low-feedback system

For external organisations, this creates a distinctive engagement environment.

Officials may read and consider external analysis carefully, but detailed feedback is uncommon.

As Prof. Chadha notes, the most straightforward way to demonstrate engagement would simply be to respond.

“People want to know what they’re saying is being read and thought about. The best way to demonstrate that is to say: ‘I read your paper - let’s have a chat.’”

But that exchange does not always happen.

“The Treasury absorbs, but it doesn’t interact.”

Over time, that can shift where policy debates take place.

“If you don’t think they’re going to come back to you, why would you wait? People may carry on the debate in the media instead.”

In other words, the conversation often moves into the public arena prematurely rather than remaining within government for more consideration.

What this means for engaging the Treasury

None of this means external engagement is futile. The Treasury remains deeply influenced by external analysis.

But it does mean organisations need to approach engagement on the Treasury’s terms.

The first requirement is Treasury-grade analysis.

If officials are unlikely to come back with questions or requests for clarification, the material you put in front of them needs to be able to stand on its own. That means framing arguments in a way that aligns with the department’s analytical approach and priorities.

In practice, that often means thinking about proposals through the same lenses the Treasury uses itself: fiscal sustainability, value for money, and the kind of appraisal frameworks set out in guidance such as the Green Book.

Ideas that do not engage with those frameworks rarely travel far inside the building.

The second requirement is proactivity and persistence.

In a system with limited feedback loops, it is rarely enough to publish analysis and assume it will find the right audience. Ensuring that ideas reach the relevant officials and are understood in the context intended, often requires sustained engagement over time and may favour well-funded lobbyists rather than disinterested independent analysis.

Finally, influence tends to accumulate through credibility and consistency, rather than single interventions.

As Prof. Chadha puts it succinctly:

“It’s a repeated game involving reputation.”

Officials faced with a constant flow of external input inevitably rely on signals of credibility. Individuals and institutions that repeatedly produce rigorous analysis, and demonstrate an understanding of how the Treasury approaches problems, are far more likely to be taken seriously.

For organisations engaging with the department, the lesson is straightforward - success rarely comes from a single well-timed intervention.

Instead, it comes from building a track record of analysis that the Treasury recognises as serious, credible and aligned with the way it thinks about policy problems.

In a system where ideas are absorbed quietly and debate happens largely behind closed doors, reputation, built patiently over time, becomes one of the most valuable assets external actors can have.