Adult Social Care Glossary, v 0.6

(5) A local authority may combine a needs or carer's assessment with an assessment it is carrying out (whether or not under this Part) in relation to another person only if the adult to whom the needs or carer's assessment relates agrees and—
(a) where the combination would include an assessment relating to another adult, that other adult agrees;
(b) where the combination would include an assessment relating to a child (including a young carer), the consent condition is met in relation to the child.

(6) The consent condition is met in relation to a child if—
(a) the child has capacity or is competent to agree to the assessments being combined and does so agree, or
(b) the child lacks capacity or is not competent so to agree but the local authority is satisfied that combining the assessments would be in the child's best interests.