A maximum-range photo so not the best resolution.
Currently docked at the Outfitting Quay at H&W. Truly an immense ship. She is not transponding on AIS so I don't know what or who she is. Look at all the superstructure!
Reminds me of those enormous space-vehicle tracking vessels that the Soviet Union deployed.
She is the Sea Rose floating production, storage & offloading vessel normal operating off the Newfoundland coast. Built by Samsung and capable of storing 850,000 barrels-equivalent of oil in an ice-strengthened hull.