Three guns in a British 15-inch twin turret

Could a British twin 15-inch turret take three guns of that calibre?

The calibre would probably need to fall to about 13.5 inches, and the arrangement would still be cramped.

The British twin 15-inch turret has comfortable room for its existing pair of guns but limited spare width. A triple mounting would probably require reducing the calibre to about 13.5 inches. Even that arrangement would be a tight fit.