From Mental Health Law Online
The attorney's signature in Part C was witnessed but the witness did not sign his name. On the application of the attorney the court declared that the instrument was defective in a material respect and did not take effect as an EPA. [OPG summary - EPA case.]
Summary from OPG website.
Title: Re Devine (an order of District Judge Eldergill made on 13 October 2010)
Heading: Whether the instrument was validly executed
Not on Bailii - no transcript