From Mental Health Law Online
The donor appointed two attorneys to act jointly. She then gave the following guidance: "Should the need arise relating to the management of my financial affairs and my business interests, whoever at the time is acting for me personally as my accountant or solicitor shall adjudicate over my personal financial interests and whoever is acting professionally for me in respect of my business interests either my accountant or solicitor shall adjudicate over my business interests." On the application of the Public Guardian the court severed the provision from the LPA on the ground that it could potentially oust the jurisdiction of the court. [OPG summary - LPA case.]
Summary from OPG section of Justice website.
Title: Re Steiner (an order of the Senior Judge made on 17 October 2011)
Heading: Severance of restrictions fettering an attorney's authority
Not on Bailii - no transcript