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The High Court exceptionally heard this age assessment case, it having been mis-listed: the UTIAC has sufficient jurisdiction for judicial review of this type of case and is the appropriate forum not the High Court (R (FZ) v LB of Croydon  EWCA Civ 59).
A brief overview of the current age assessment law is at §§6-9. After a fact finding hearing the C was found to be 22 years old. The J found that the age assessment was fair and Merton compliant.