LB Haringey v FG (No. 1)  EWHC 3932 (COP)
"In this case there are a number of matters: does H have capacity to conduct litigation; does she have capacity to decide where she should live, or capacity to decide where she should be educated, or capacity to decide on the extent of the contact and relationship she should have with her natural family; capacity to deal with her financial affairs, or to enter into what has been described as a tenancy agreement, and capacity in a sense to judge her own best interests in those respects?"
Thanks to Alex Ruck Keene (39 Essex Chambers) for providing the judgment.
Possible Bailii link (not there when checked last night, but might have appeared since)