concrete once drilling and reaming operations for the particular section of the wellbore 1 are completed a wellbore tubular running and wellbore reaming apparatus 5 comprises a cutting structure which in this example is a reamer shoe 7 connected to an output shaft 9 rotation of the output shaft 9 rotates the reamer shoe 7 in the present example the cutting structure can be sacrificed after running the liner or casing 3 is completed the output shaft 9 comprises a rotor of a motor generally indicated 11 the rotor in this example may be radially inward of a radially outward stator 13 fixedly connected to the lowermost end 4 of the liner or casing 3 the stator 13 may be concentric with and extend around the periphery of the output shaft 9 and is thus of hollow form when viewed from the side or in transverse cross section the stator 13 is therefore radially spaced from the rotational axis 10 of output shaft 9 such that it does not when viewed in cross section from the side extend across the output shaft 9 the output shaft 9 may be formed with an access bore 15 that extends along the length of the motor 11 from the reamer shoe 7 to the opposite distal end of the output shaft 9 that is the end adjacent the lowermost end 4 of the liner or casing 3 the access bore 15 in this example is co axial with the axis of rotation 10 of the output shaft 9 the access bore 15 may extend in a direction aligned with but not co axial.