There is disclosed a method of forming a tubing lined borehole, the method comprising the steps of forming a borehole; enlarging part of the borehole by increasing the
diameter thereof; and locating bore-lining tubing in the borehole with at least part of the tubing located in the enlarged part of the borehole, and a corresponding a tubing lined borehole.There is also disclosed a downhole
cutting tool comprising a tool body; and at least one
cutting element mounted for radial movement with respect to the tool body between a retracted position and a
cutting position, in the cutting position the cutting element describing a cutting
diameter and an axially extending annular space inwardly of the cutting element, and a corresponding method.