Artists routinely play fast and loose with local topography. Hills suddenly appear and cliffs triple in height if it will make a picture look prettier, so this scene could be just a fantasy.
Are you sure that it is in England? At first glance, without the benefit of seeing the original, my first thought was Malta, Grand Harbour, with Fort St Angelo on the right and Fort St Elmo on the left. Compare with this Anton Schranz picture...