 A solution became possible when the redesign of the "Leander" for the NZ in 1968-69 for HMNZS "Canterbury"; removal of the anti-submarine mortars giving more internal space below deck.In 1960, the Royal Navy had seriously considered the "Otago"-class design as an alternative to the "Rothesay" Type 81 general purpose frigates for future development with a design that would have carried one or two Westland Wessex anti-submarine helicopters.Proposals to fit a hangar and landing pad to "Otago" without complete reconstruction were rejected by RNZN CNS in the 1970s as jeopardizing the RNZN case for a new combat ship..