4. The Authority shall continue to perform—
(a)such functions relating to capital works, the procurement of supplies, the provision of computer services and the provision of wheelchairs, artificial limbs and appliances, invalid carriages and motor cars as the Secretary of State may direct it to perform on his behalf;
(b)such functions relating to the examining, checking and pricing of prescriptions for drugs, listed drugs, medicines and listed appliances supplied as part of pharmaceutical services as the Secretary of State may direct it to perform on behalf of Family Authorities;
(c)such functions relating to the collection, validation, processing and protection of personally identifiable data as the Secretary of State may direct it to perform on his behalf and on behalf of District Health Authorities and Family Authorities;
(d)such functions relating to manpower, medical audit, emergency and strategic planning and the promotion of cost improvement and income generation as the Secretary of State may direct it to perform on his behalf and on behalf of District Health Authorities and Family Authorities, and
(e)such other functions as the Secretary of State may direct it to perform on his behalf or on behalf of a District Health Authority or a Family Authority.