Helen covers a broad spectrum of tax transactional matters for corporates, global financial investors, and asset managers. Her work includes public and private M&A, joint ventures, IPOs, restructuring, and financings, and spans a number of sectors, including telecommunications, infrastructure, insurance, healthcare, tech, and fintech based businesses. 

Helen also has extensive experience advising on partnership taxation matters and management incentivisation. Whilst much of her work in this area is sponsor-side, she has acted for a number of founders and management teams on exit and rollover tax considerations.

Helen has advised numerous financial institutions on structured and asset finance deals during the course of her career. 

Ms. Lethaby’s experience includes advising:

Capital D Management

  • Capital D and management on the sale of Qmee, an online survey platform and fraud prevention technology provider, to Kantar, a leading marketing data and analytics company


  • Epiris on its acquisition of Inchcape Shipping Services, a global provider of port agency and marine services

Authentic Brands Group

  • On its strategic partnership with David Beckham to co-own and manage Beckham’s global brand

PAI Partners and British Columbia Investment Management Corporation

  • In connection with the sale of a majority stake in Refresco, one of the world’s largest independent beverage contract manufacturers, to KKR


  • A leading provider of integrated payment and technology solutions, on its acquisition of Finaro, a cross-border eCommerce payments provider with a large European presence

Landon Capital

  • On its investment in a consortium of US family offices that acquired Paladone Holdings Limited, a lifestyle products and wholesale gift supply company


  • On the US$1.1 billion acquisition of Kobalt Capital’s music rights portfolio


  • On the £2.2 billion acquisition of William Hill International
  • On an accelerated bookbuild placing of 19.1% of its issued share capital, for 230 pence each

Advent International

  • On the acquisition of Alvogen’s Central and Eastern and European pharmaceuticals business*
  • On the acquisition of ICE, an Italian pharmaceuticals company, from the Bartoli family as well as the bolt-on acquisition of New Zealand Pharmaceuticals from Archer Capital*
  • On the sale of Ammeraal Beltech, a leader in conveyor belts manufacturing, to Partners Group*


  • On its sale of CPA Global, the world's leading IP management and technology company, to Leonard Green & Partners, L.P., a deal which valued the business at £2.4 billion*
  • On the acquisition of One.com, a web-hosting business, from Accel-KKR*
  • On the sale of Northgate Public Services Limited to NEC Corporation*
  • On the acquisition by Hotelbeds (a portfolio company owned by Cinven and CPPIB) of GTA Travel from Kuoni*
  • On its acquisition of a majority stake in Arcaplanet, a pet care retail chain, from funds advised by Permira and Winch Capital Partners*


  • On its acquisition of a majority share in Cloudreach, a leading, fast-growing global cloud enabler headquartered in London, and the bolt-on acquisition of a majority stake in Philadelphia-based cloud computing analytics company Cloudamize Inc*
  • On the sale of Center Parcs Europe resorts in Germany, Netherlands and Belgium to Aroundtown*
  • Leading a consortium comprising GIC and MassMutual on its acquisition of Goldman Sachs' shareholding in Rothesay Life, one of the leading providers of annuity risk transfer solutions in the UK, in a deal valuing the group at around £2 billion*


  • On the restructuring of its investment in Brussels airport, triggered by the exit of Macquarie funds and replacement with an APG led consortium*
  • On the selldown of minority interests in Bristol and Birmingham Airports*

Warburg Pincus

  • On the acquisition of a minority interest in Inspired Education*
  • On the acquisition of Constructionline from Capita*
  • On its sale of Safetykleen Europe, the largest service provider of surface treatment and chemical application services, to funds advised by Apax Partners and its sale of the ETF Provider, Source, to Invesco* 


  • On the merger of Tilney (a Permira portfolio company) and Smith & Williamson, a leading wealth manager*
  • On the merger of Tilney (a Permira portfolio company) and Smith & Williamson, a leading wealth manager*

Centerbridge Partners

  • Leading a consortium on its acquisition of Sompo Canopius, a Lloyd's of London insurance business, from Sompo Japan Nipponkoa Insurance for US$952 million as well as on the bolt on acquisition of AmTrust at Lloyd’s* 

General Atlantic

  • On the sale of stake in Argus Media to Hg Capital*

Montagu Private Equity

  • On the acquisition of Wireless Logic from CVC*


  • On its purchase of a 51% equity interest in Glencore's worldwide\e petroleum products storage and logistics business for approx. US$775 million*

APG Asset Management

  • Leading a consortium comprising National Pension Service of Republic of Korea and Swiss Life Asset Managers on the acquisition of majority interest in Brisa, a toll road platform business, from JdM and Arcus Infrastructure*

*Matter handled prior to joining Latham

Bar Qualification

  • England and Wales (Solicitor)


  • Legal Practice Course, College of Law, 1995
  • Diploma in Law, College of Law, 1994
  • BA, Fitzwilliam College, 1993
    First Class Honours

Languages Spoken

  • English