This is a pic I took from the Captain’s seat on the bridge of HMS Belfast, the WW2 battleship moored in the Thames in London. The vessel’s a huge tourist attraction, but notice the guns are all pointing in the same direction and are also of the same elevation.

The guns have a range of fourteen miles, so if they were fired, where would the shells explode? A field behind the Scratchwood services on the M1 motorway would be turned into a huge and deep hole – Health and Safety and the anti-terrorist branch think of everything!