Where, before the commencement of this Act, a body corporate has been appointed sole trustee of a charitable trust, then, during such time before and after such commencement as the body corporate has held and continues to hold the office of trustee of the trust -

(a) the terms of the trust shall be deemed to have provided for and required and to provide for and require the appointment of one trustee only, and

(b) one trustee only of the trust shall be deemed to have been originally appointed under the terms of the trust.