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LONDON, Nov 12 (Reuters) - A Palestinian rights group was on Wednesday refused permission to appeal a ruling that Britain lawfully allowed F-35 fighter jet components to be indirectly exported to Israel, despite accepting they could be used to breach international humanitarian law. Al-Haq, a group based in the Israeli-occupied West Bank, unsuccessfully challenged Britain's Department for Business and Trade over its decision last year to exempt F-35 parts when it suspended export licences for arms that could be used in the conflict in Gaza. Sign up here. The group last month asked the Court of Appeal for permission to challenge a lower court ruling that found Britain's decision was lawful and dismissed Al-Haq's challenge. The Court of Appeal refused permission, saying in its ruling that it was a matter for the government to decide whether national security issues relating to the supply of F-35 components outweighed an assessment that Israel was not committed to complying with international humanitarian law. Reporting by Sam Tobin; Editing by Catarina Demony