Lawrence Graham has pulled off an insolvency first, advising long-term client Grant Thornton on the simultaneous administration of more than 800 companies.
Nick Pike, corporate recovery partner at Lawrence Graham, and his team asked High Court judge Mr Justice David Richards for permission to combine the 844 administration applications.
The court would have had to deal with more than 3,000 lever-arch files of evidence if Lawrence Graham had filed separate applications for the companies. The combined application only used four lever-arch files.
Pike said: "We don't know of anywhere where so many applications have been dealt with at once. [The judge] was delighted we followed this route."
The companies are involved in a search for £30m of unpaid tax conducted by HM Revenue & Customs. They were managed by a UK tax adviser which has been at the centre of the investigation.
"The next step is to work out what claims the 844 companies have against the tax company," said Nick Pike.
Bivonas, Pinsent Masons and Tarlo Lyons are acting for the directors of the tax solutions provider.
A High Court hearing to find the missing tax is set for March next year.