Where (by virtue of section 423(3)) joint arrangements are made under section 423(2) by the governing bodies of two or more schools, paragraph 2 shall apply as if any reference to the governing 0body or to the governors were a reference to the governing bodies or (as the case may be) the governors of both or all the schools; and an appeal pursuant to such joint arrangements shall be to an appeal committee constituted in accordance with paragraph 2 as it so applies.