 Among the improvements the 40 mm gun was replaced with Seacat missile system, radar and communication equipment was updated, accommodation improved and perhaps most significantly a helicopter flight deck and hangar were added.Although this required the removal of one of the two triple barrelled anti-submarine mortars, it allowed the "Rothesay" class to carry the Westland Wasp helicopter which was a huge asset for anti-submarine operations.This modernisation was a vast improvement over the "Whitby" class and brought the "Rothesay" class up to the standard of the succeeding .