To remove doubt, it is declared that a person in the custody of a watch-house manager at a watch-house does not stop being in custody of the watch-house manager only because—
(a) the person is being transferred by a watch-house officer to or from a holding place under section 653 (1) ; or
(b) the person is being escorted by a watch-house officer to or from a place other than a watch-house including, but not limited to, for receiving necessary health care.