bring her up largely to the standard of the later . Six twin L70 40 mm Bofors would have been fitted, it having been planed to adopt AA guns smaller than 76mm since WW2 as soon as proximity fuses could be fitted to shells smaller than 3 inches as the higher rate of fire of the smaller shells was more effective and the existing L60 solid shell 40mm was ineffective at more than a mile range. but Swiftsure would have retained her original triple 6-inch turrets. Midway through the conversion in August 1959, with her new bridge and lattice masts in place, the refit was cancelled. Some reports and the government statement to Parliament in 1962 say the refit was costing too much to produce an obsolete ship. Original estimates for the refit in 1956 had been 4 million pounds. The damage suffered during her earlier collision with Diamond was not fully surveyed at the time and only became apparent during the refit. The extra work delayed the modernisation and after expenditure of more than 1 million pounds, and facing far higher dockyard labour and material costs, modernisation as a gun cruiser was abandoned. In a photo from April 1960 of Swiftsure at Chatham dockyard, shows the three turrets reinstalled and the reconstruction partially complete suggesting the rebuilt hull had sufficient strength. Even with the six channel AA fire control system planned for Swiftsure (which combined 40 mm and 4-inch fire against specific targets) the twin 4-inch turrets with roof mounted tracking radar were still slow firing and obsolete compared with the USN twin 3/50 fitted to HMS Victorious or RN twin 3-inch/70 fitting to the Tiger cruisers. The plan to fit 3/70 turrets to Swiftsure and Superb was abandoned in 1951 and the intended 40mm L/70 AA rearmament of HMS Swiftsure apppears to have been abandoned because it required a 0.5 million pound conversion to AC power and secondly because the Sandys Defence Review led to the final cancellation of ordered single and twin 40mm L70 mounts for the RN in favour of the unproven Greenlight/ Seacat missile. New little improved versions of the RN Mk 19 Twin AA guns were fitted in RN cruiser refits through the 1950s, for the last time in HMS Bermuda in 1957 and Belfast in 1959 but were obsolete, and inaccurate compared with single Mk 5, 55 degree elevation 4.5-inch guns refitted on