(1)Unless section 21(1)(a) applies, the local mental health partners for a local authority area must carry out assessments and make referrals in accordance with–
(a)the arrangements for their area agreed under section 19; or
(b)the arrangements for their area determined by the Welsh Ministers under section 21.
(2)If arrangements have been altered under section 19(5) or 21(2), assessments must be carried out and referrals made in accordance with the altered arrangements.