Aiming where?

HMS Belfast is the only surviving light cruiser from the 1930s.  It is moored on the River Thames, close to Tower Bridge in London.

Not many people know that the guns of turrets A and B are aimed at a specific place, namely at Scratchwood Service Station (now renamed as London Gateway Services) on the M1 motorway on the northern edge of London.  The 'target' is over 12 miles away.

Having never visited that particular service area, I have no idea what it did to deserve this ignomy (or infamy).