De facto control of a third party’s documents. A key battleground for disputes.

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Disclosure of documents is a critical step to any dispute. Under PD57AD, a party gives disclosure by stating “that a document that is or was in its control has been identified or forms part of an identified class of documents and either producing a copy, or stating why a copy will not be produced”.
It is accepted that an arrangement or understanding which gives a party practical or de facto control of a third party's documents is sufficient to constitute control for disclosure purpose. There does not need to be a legally binding right to access the documents.
What constitutes ‘de facto control’ has been a recent battleground for parties and there has been a large number of recent cases covering it. The latest decision in that arena is: Mornington 2000 Llp (t/a Sterilab Services) & Anor v The Secretary of State for Health And Social Care [2024] EWHC 1708 (TCC) (“Mornington 2000”).
The case concerned contracts for the supply of Covid-19 lateral flow test kits and in Mornington 2000 the Defendant successfully obtained a declaration from the Court that documents held by the Claimant’s subcontractors (suppliers / manufacturers based in Germany and China) should be searched as part of its disclosure obligations.
What are the key points to note?
Lawyers will welcome the consistent approach of applying the factors in Berkeley Square Holdings Limited v Lancer Property Asset Management Limited [2021] EWHC 849 (Ch) (as slightly modified by recent cases); and with each case, the nuances around the issue of control become clearer. Parties in a dispute need to be mindful that the obligation to preserve, search for and disclose documents can extend beyond their organisation and could include sub-contractors.
Want to discuss the law, technology and practice? Get in touch with our expert team: David Hine, Tom Whittaker and Stacie Bourton.
"The contractual assistance clauses are the starting point for inferring the arrangement or understanding which I find to be present in this case, but there are significant other factors which give rise to that inference, including in particular the evidence of past access to documents being provided by Boson." - Jason Coppel KC: