The Grierson rule against second appeals applies to refuse jurisdiction over a further application for leave to appeal against sentence where the first application was refused on the merits. The mere repetition of grounds, formulation of different grounds, reliance on new evidence, or lack of legal representation at the first hearing does not take the case outside the general rule. The position regarding second applications for extension of time to appeal against conviction remains not entirely settled, though such applications will fail if raising the same grounds previously considered.
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