Hi! It is a simple calculation. As per Miramar Shipindex "ALBA JULIA" (ex CARL LEGIEN) had a maximum speed of 10,5 knots. Weather allowing calculated with 9 knots maximum speed and no loading/discharing port between Malta and London. 9 knots per hour x 24 hours a day = daily distance = 216 nautical miles per day. Distance Malta to London 2.313 nautical miles ./. 216 nm/day = 10,7 days. Roundabout 11 days minimum sea transit time. Depending on discharge/loading ports you should caldulate with three to four weeks min. travelling time. Sorry, but no information re. London berth of "ALBA JULIA" available.
PS.: More info re ALBA JULIA: http://www.shipspotting.com/gallery/photo.php?lid=1784049