CYMBELINE or OSWESTRY GRANGE loading with SUMBURGH/RORA/BARRA HEAD in front of her. 1st guess was WASHINGTON being moved by the tugs but she looks loaded so could rule her out Regards Graham
Here is Type 21 Arrow at Corporation quay undated courtesy Whickham Dave. Belongs to the 4th Frigate squadron at this time. Not the one mentioned as is port side to but at least shows the berth. Plus her mainmast is grey, not black.