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

Lydia Challen is recommended as ‘authoritative and confident'. Legal 500 2014

Interviewees praise the "exceptionally able" Lydia Challen as being "very good at getting to grips with the complexities and cutting through the details." Chambers UK 2015

Lydia Challen earns considerable praise from interviewees, who report that "her technical skills are excellent and her ability to explain complex matters in a simple way is unparalleled." Chambers UK 2014

"The absolutely brilliant Lydia Challen is also held in the highest regard by clients". Chambers UK 2012

News & insights

Regulatory Monitoring

Publications: 01 DECEMBER 2020

Regulatory Monitoring - relevant developments regarding German and European regulatory law

Our monthly regulatory newsletter monitors all relevant developments regarding German and European regulatory law in English language.

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Publications: 01 DECEMBER 2020

In Credit podcast: FCA guidance on Covid support to consumers in the UK

In this episode of In Credit, Joanne Owens, Victoria Ferres and Sophie Skeet, members of our consumer finance team, discuss the impact that the coronavirus pandemic has had on the consumer lending…

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Hong Kong's Securities and Futures Commission (SFC) Enforcement Actions Tracker

Publications: 30 NOVEMBER 2020

Hong Kong’s Securities and Futures Commission (SFC) Enforcement Actions Trends and Tracker

The SFC published its annual report for 2019/2020 in June and has also published its quarterly report for Q2 2020.

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A busy road junction

Publications: 26 NOVEMBER 2020

National Security and Investment Bill: the impact on energy and infrastructure

On 11 November the UK Government published its ground-breaking National Security and Investment Bill. 

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Allen & Overy LLP
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

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.