Who shapes the rules: lobbying, the revolving door, and the Australian tax-leak scandal

If the rules favour scale, it is fair to ask who helps write them. This page sets out the documented record of access to tax policy: how lobbying transparency works and where it falls short, who gets meetings with Treasury ministers, the revolving door between the Treasury and the finance sector, and the single cleanest public-record case of a firm exploiting government access, a Big Four firm that leaked confidential government tax plans in Australia. The strict rule on this page: every fact here appears because an official register, a Parliamentary inquiry, a Senate committee or a regulator put it on the record first, and we describe the people involved by their role rather than name them in the prose. We make no novel accusation. We report the record and link to it.

The transparency gaps, by design

The UK's formal lobbying register is narrow. The Office of the Registrar of Consultant Lobbyists, created by the Transparency of Lobbying Act 2014, covers only consultant (third-party) lobbyists. In-house corporate lobbyists, trade associations, think tanks and the accountancy firms that advise on tax policy are all outside it.

The Spotlight on Corruption report Levelling the Playing Field (March 2025) documented the gaps in detail. Government guidance for officials on contact with professional lobbyists had not been updated for 27 years, since 1998. None of the six major economic departments studied routinely published details of staff secondments.

Who gets in the room

Spotlight analysed five and a half years of meetings, hospitality and secondment data, from January 2019 to June 2024, across six economic departments including HM Treasury. The pattern, in the report's own figures:

• Business groups made up 82.6% of those meeting ministers and officials; civil society, consumer groups, unions and academics together made up 8.2%.
• Two of the largest UK banks alone attended 271 meetings with Treasury ministers, more than all civil society, consumer and public-interest groups combined, which managed 244.
• The same two banks provided the first and second most hospitality to senior Treasury officials.
• Senior officials at the Department for Business and Trade accepted corporate hospitality 3.8 times a week, rising to 5.8 times a week under the new Labour government.
• 68% of all events-related hospitality in the period went to special advisers, who are largely exempt from transparency rules.
• Between January 2020 and October 2024 the Treasury took 16 secondees from industry, one from a university, and none from charities.

On consultations, where rules are actually made: ten businesses, mostly trade bodies and accounting firms, made at least 176 submissions to Treasury consultations between 2019 and 2024, while meeting Treasury ministers 535 times in the same period. Where respondents were named, 51% were industry, 21% members of the public, and just 6% civil society or consumer groups.

The Big Four secondment model

The accountancy firms are a special case because they help write the rules and then advise clients on them. In April 2013, the House of Commons Public Accounts Committee found that the Big Four firms were using knowledge gained from staff seconded into HMRC and the Treasury to advise corporate clients on the very rules those staff had helped write. The committee's chair, on the record, was concerned that returning Big Four staff carried "the very inside knowledge" needed to help clients exploit the legislation.

The Bureau of Investigative Journalism reported in 2012 that the Big Four had provided £1.36 million worth of staff costs and nearly £500,000 in consultancy to political parties since 2009, with all three main parties receiving services. Richard Murphy of Tax Research UK called the arrangement "corporate capture of our tax system"; that is his attributed characterisation. The pattern persisted: by mid-2024 the Department for Business and Trade had taken 19 secondees from industry, seven from academia and one from a charity, and the energy department 38 from industry, 16 from universities and one from a charity.

The cleanest case on the record: the Australian tax-leak scandal

The most thoroughly documented example anywhere of a firm exploiting government access for commercial gain is a Big Four firm's tax-leak scandal in Australia, per the Australian Senate inquiry. The firm's international tax chief was engaged by the Australian Treasury as a confidential consultant on new anti-avoidance law, the Multinational Anti-Avoidance Law, from 2013.

Despite signing confidentiality agreements, that partner shared Treasury's confidential design details with at least 53 colleagues through a minimum of 144 internal emails between 2013 and 2018. The firm used the information to win multinational clients and help them structure around the very law being written, earning an estimated AUD 2.5 million from the first stage of those leaks alone. In June 2023, the Senate Finance and Public Administration References Committee found that the firm's partners "had no regard for their obligation to maintain confidentiality" and sought to "aggressively monetise confidential Commonwealth information".

The government response, announced in 2024, was described by ministers as the biggest crackdown on tax-adviser misconduct in Australian history: maximum penalties for promoting tax-exploitation schemes raised from AUD 7.8 million to AUD 780 million, new referral powers for the tax office and the Tax Practitioners Board, the court time-limit for tax cases extended from four to six years, and restrictive tax-secrecy limits removed. A second Senate report in June 2024 said members "remain concerned" that the firm had not been transparent about the full scope of the scandal, and called for it to publish the names and positions of all those involved.

The revolving door

Spotlight documented that a quarter of revolving-door decisions involving Treasury ministers and senior officials between 2019 and September 2024 related to financial services firms. Two documented examples, both on the public appointments register (ACOBA) that vets such moves: a former Chancellor who joined a fintech he had backed in office, and a former Treasury Permanent Secretary who moved to an investment bank. In the same period, 50% of Treasury special advisers (seven of fourteen) went to work for lobbying firms. The same pattern is documented in the United States: in September 2021 the New York Times reported how top US accounting firms place their tax lawyers in the Treasury Department for short stints, with the expectation of higher pay on their return; the article named one Big Four firm's tax specialists as examples.

Political donations

Total UK political donations grew by nearly 250% between 2001 and 2019, passing £100 million in real terms for the first time in 2019, with the share from "super-donors" giving over £100,000 rising from about 31% in 2017 to 45% in 2019. As of January 2025, Transparency International UK found no limit on how much any individual or company can donate to a UK political party. Meetings between ministers and party donors are not published. In 2021, at least 79 donors were eligible to join a Conservative party forum with access to the Cabinet, of whom 15 paid enough to regularly meet the Prime Minister, with no public record taken of those meetings.

What the record shows, and what it does not

None of this is an allegation of corruption, and we make none. It is a documented map of access: who gets the meetings, who moves between government and the finance sector, and who funds the parties. The arithmetic of it is plain. When business attends ten times as many meetings as the public interest, when the rule-writers and the client-advisers are the same firms, and when the people who make the move from Treasury to bank are on a register because the move was expected to need vetting, you do not need a conspiracy to explain why the rules tilt the way they do. You need only read the registers, which is all we have done.