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Lydia Challen



Challen Lydia
Lydia Challen



Lydia specialises in all aspects of corporate tax, including M&A, corporate reorganisations and private equity tax. She regularly advises multinational corporate groups in relation to their tax affairs and on structuring issues. On the transactional side, she has extensive experience of advising in relation to disposals by public and private companies, complex financings (including restructurings) and corporate reorganisations.

She co-chairs the Tax Committee of the Law Society of England & Wales. She is a regular contributor to consultations with HM Revenue & Customs and the UK Treasury on the development of legislation and tax policy.

Lydia is ranked as a Leading Individual in Legal 500’s category, Corporate Tax 2021/22.

"Very knowledgeable, smart and straight to the point." Chambers & Partners, UK.

"A joy to work with and exceptionally good." Chambers & Partners, Europe.

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Publications: 12 January 2023

OECD Pillars: Full steam ahead

2023 is set to be a year of change for the global tax landscape. After many years of negotiation, development and consultation, implementation of the OECD’s Pillar One and Pillar Two reforms to…

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Publications: 18 November 2022

UK commits to global minimum tax rate

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News: 17 August 2022

A&O advises on QinetiQ’s proposed acquisition of Avantus

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News: 24 December 2021

A&O advising Reckitt on the proposed sale of E45

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Fraudulent emails

Please note there is a known fraud/scam currently using the Allen & Overy brand and Lydia Challen's name.

More information on fraud using the Allen & Overy brand can be found here.



One Bishops Square
E1 6AD

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Admitted as barrister, England and Wales, 1995

Admitted as solicitor, England and Wales, 2007


Bachelor, University of Cambridge, 1993

Master, Oxford University, 1994