PORTLAND Back – The Type 23 Frigate PORTLAND has completed a £27 million 50 week refit at Rosyth (Babock) where a total of 19 major system and capability upgrades have been undertaken including the installation of new anti-submarine warfare sonar, full upgrade of the ship’s computer systems, an overhaul of the SEAWOLF missile system, replacement of guns, refurbishment of the galley and upgrades of accommodation.    PORTLAND will now undertake a three month period of sea trials and training before returning to the fleet.