Subject to the provisions of this Act, every person who is employed in the National Institute of Mental Health and Neuro-Sciences, Bangalore, immediately before the commencement of this Act, shall, on and from such commencement, become an employee of the Institute and shall hold his office or service therein by the same tenure, at the same remuneration and upon the same terms and conditions and with the same rights and privileges as to pension, leave, gratuity, provident fund and other matters as he would have held the same on the date of commencement of this Act if this Act had not been passed, and shall continue to do so unless and until his employment is terminated or until such tenure, remuneration and terms and conditions are duly altered by regulations:
     Provided that the tenure, remuneration and terms and conditions of service of any such person shall not be altered to his disadvantage without the previous approval of the Central Government.