Settled seniority and delay laches prevent reopening stale service claims based on departmental opinions and practice.

Departmental letters or long-standing administrative practice cannot alter inter se seniority in the absence of statutory rules, because mere departmental opinions are not the same as binding executive instructions. The distinction between seniority and promotion eligibility remains material, so seniority alone cannot override prescribed promotion conditions. Challenges to settled seniority and consequential promotion claims raised after an inordinate, unexplained delay are ordinarily barred by delay and laches, especially where third-party rights and completed promotions have accrued. The stale seniority dispute was therefore not to be reopened, while only a limited surviving question in one connected writ petition remained for consideration.

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Issues: (i) whether, in the absence of statutory rules, inter se seniority of Sub-Inspectors from different wings could be altered on the basis of departmental letters or long-standing administrative practice; (ii) whether challenges to seniority and promotion claims raised after long delay were liable to be rejected on the ground of delay and laches.

Issue (i): whether, in the absence of statutory rules, inter se seniority of Sub-Inspectors from different wings could be altered on the basis of departmental letters or long-standing administrative practice.

Analysis: Where the rule book was silent on inter se seniority, executive instructions could have filled the gap, but mere opinions expressed by departments did not amount to executive instructions. Long-standing administrative practice may be relevant under the doctrine of contemporanea expositio, but it is not controlling where no legal basis supports the claimed change. The distinction between seniority and eligibility for promotion was also material: seniority by itself does not override prescribed eligibility conditions for promotion.

Conclusion: The departmental letters could not be treated as executive instructions, and seniority could not be recast on that basis.

Issue (ii): whether challenges to seniority and promotion claims raised after long delay were liable to be rejected on the ground of delay and laches.

Analysis: The settled rule in service jurisprudence is that seniority lists and promotions that have remained undisturbed for a reasonable period should not be reopened, because third-party rights accrue and settled positions should not be unsettled by stale claims. A person aggrieved by seniority or promotion must approach the forum promptly, and inordinate delay, especially after multiple promotions have intervened, is ordinarily fatal unless satisfactorily explained.

Conclusion: The belated challenges were not maintainable and ought to have been rejected on the ground of delay and laches.

Final Conclusion: The appeals succeeded to the extent that the stale seniority disputes were not to be reopened, while the matter concerning one connected writ petition was sent back for consideration only on the limited surviving question.

Ratio Decidendi: In service matters, settled seniority cannot be disturbed on the basis of departmental opinions or unratified practice, and any challenge to seniority or consequential promotion made after an inordinate and unexplained delay must ordinarily be rejected to protect accrued rights.

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