In Roshan Lal Tandon v. Union
of India, 1968 (1) SCR 185, it was held by this Court
that once appointed an employee has no vested right
in regard to the terms of service but acquires a status
and, therefore, the rights and obligations thereto are
no longer determined by consent of parties, but by
statute or statutory rules which may be framed and
altered unilaterally by the Government. The High
Court has also noticed that there was an avenue
provided for promotion but the prescription of the
qualification was not favourable to respondents. The
principle of avoiding stagnation in a particular post
will not be with reference to a particular individual
employee but with reference to the conditions of
service as such.