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The Royal Navy's Queen Elizabeth-class aircraft carriers have seen costs double to £4 billion, affecting other critical programs. Technical issues, particularly with propeller shaft couplings, and a severe personnel shortage hinder operational capacity.

With insufficient F-35B Lightning IIs, the carriers are viewed as redundant in a US-led alliance. The Royal Navy's shift to these carriers has led to a neglect of other vital naval capabilities, raising concerns about future returns on investment.