From Mental Health Law Online
The donor appointed two attorneys to act jointly and severally, and contained the following restriction: “For single transactions of a value in excess of £500 (five hundred pounds) then I declare my attorneys shall act jointly as against jointly and severally.” On the application of the attorneys under paragraph 4(5) of Schedule 4 of the MCA to determine whether the power was valid, the court severed the restriction. (OPG summary.)
The summary above is taken from the OPG website. It is listed under the heading "Severance of restrictions incompatible with a joint and several appointment" as "Re Blair (an order of the Senior Judge made on 1 October 2008)".
Not on Bailii - there was no written judgment