Pity that none are clearly identifiable. The Ellerman does look rather like one of the WW1 standard types. The freighter at the top has distinctive funnel marks but whose?
Top vessel Brocklebank possibly? Before WW2 the RAF took photographs of Port installations mind you so did the Luftwaffe using aircraft with civilian markings.
Well spotted Dave, the well-known 'Bucknall teeth'. The top ship isn't a Brock, looks like a red star on white over blue, or some similar combination. The outer tier vessel, possibly United Africa.