'The firm sought to cripple her financially with libel action in UK courts,' Caruana Galizia's three sons claim in a letter to the writers' campaign group English PEN and seen by the Guardian.

Letters from Mishcon, seen by the Eye, order her to remove articles discussing the lucrative sale of Maltese passports and the EU citizenship that goes with them.

[28] Mishcon de Reya's Employment team won a case in the UK Supreme Court on behalf of its client Krista Bates van Winkelhof, in which it was determined that members of limited liability partnerships (LLPs) do have the protection of whistleblowing legislation.

[30] In 2016 the company co-ordinated a challenge in the High Court by Gina Miller, an investment manager and philanthropist, against the process of the United Kingdom's withdrawal from the European Union.

In a majority decision, it ruled that Parliament must vote on whether the Government could start the process of the United Kingdom's withdrawal from the European Union.

The Supreme Court unanimously ruled that Prime Minister Boris Johnson's decision to prorogue Parliament was unlawful.

In 2019 the Court of Appeal overturned the Judgment of Mr Justice Warby dated 8 October 2018 which had refused Mishcon de Reya's client, Richard Lloyd, permission to serve a representative action on Google LLC.

The claim relates to what is known as the "Safari Workaround" - Google's alleged unlawful and clandestine tracking of iPhone users in 2011 and 2012 without their consent through the use of third party cookies.