An education authority may, with the consent of the managers of any school in their area which is not a public school, and upon such financial and other terms, if any, as may be determined by agreement between the authority and the managers, make arrangements for securing—
(a)the provision of milk, meals and other refreshment for pupils in attendance at the school; and
(b)the provision, for any pupil in attendance at the school who is unable by reason of the inadequacy or unsuitability of his clothing to take full advantage of the education (including physical exercise) provided by the school, of such clothing as is necessary for the purpose of ensuring that he is sufficiently and suitably clad while he remains a pupil at the school:
Provided that any arrangements made under this section shall be such as to secure, so far as is practicable, that the expense incurred by the authority in connection with the provision of any service or article shall not exceed the expense which would have been incurred by them if the pupils had been pupils at a public school.