The Norwegian company said the 804-berth Black Watch (built 1972), the 929-berth Braemar (built 1993) and the 1,350-berth Balmoral (built 1988) will enter drydock at Blohm+Voss in Hamburg this month and in December.

The 880-berth Boudicca (built 1983) is not included, but Olsen said: "This is the first time that so many Fred. Olsen ships have undergone refurbishment within such short succession."

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