A boring system including a shaft enlargement arrangement , the shaft enlargement arrangement comprising: a hollow column proximate a lower end of the boring system ; a first cutter head that is rotatably fitted to the hollow column , with first drive means being provided to rotate the first cutter head relative to the hollow column so as to bore downwardly a hole having a diameter corresponding substantially to the diameter of the first cutter head , wherein the first cutter head comprises a support body carrying a winged arrangement , the support body being rotatably fitted to the column , the winged arrangement comprising a plurality of wings extending from the support body , each wing being fitted with, or comprising, a plurality of first cutter elements, each wing being angled upwardly and away from the support body , so to define a substantially V-shaped cutting profile; a boring head arrangement fitted to an operatively lower end of the column , the boring head arrangement terminating in a second cutter head , with second drive means being provided to drive the second cutter head so as to bore a leading hole as the boring system proceeds to bore downwardly; and a gripper arrangement fitted to the hollow column , the gripper arrangement being arranged around the column , so as to substantially enclose the column , the gripper arrangement being positioned, in use, below the first cutter head and above the boring head arrangement , the gripper arrangement being arranged to securely grip against the leading hole bored by the second cutter head , so as to secure the boring system in position within the bored hole, the gripper arrangement being fitted to an actuator arrangement secured to the column , the actuator arrangement being operable to move the gripper arrangement axially along the length of the column , to assist in the overall downward movement of the shaft enlargement arrangement . a hollow column proximate a lower end of the boring system ; a first cutter head that is rotatably fitted to the hollow column , with first drive means being provided to rotate the first cutter head relative to the hollow column so as to bore downwardly a hole having a diameter corresponding substantially to the diameter of the first cutter head , wherein the first cutter head comprises a support body carrying a winged arrangement , the support body being rotatably fitted to the column , the winged arrangement comprising a plurality of wings extending from the support body , each wing being fitted with, or comprising, a plurality of first cutter elements, each wing being angled upwardly and away from the support body , so to define a substantially V-shaped cutting profile; a boring head arrangement fitted to an operatively lower end of the column , the boring head arrangement terminating in a second cutter head , with second drive means being provided to drive the second cutter head so as to bore a leading hole as the boring system proceeds to bore downwardly; and a gripper arrangement fitted to the hollow column , the gripper arrangement being arranged around the column , so as to substantially enclose the column , the gripper arrangement being positioned, in use, below the first cutter head and above the boring head arrangement , the gripper arrangement being arranged to securely grip against the leading hole bored by the second cutter head , so as to secure the boring system in position within the bored hole, the gripper arrangement being fitted to an actuator arrangement secured to the column , the actuator arrangement being operable to move the gripper arrangement axially along the length of the column , to assist in the overall downward movement of the shaft enlargement arrangement . <EOS>