for confinement is vortex condensation [@thooft79; @mack80; @nielsen79; @kovacs98; @deldebbio98; @ambjorn98]. Here the confining degrees of freedom are the vortices created by the ’t Hooft dual disorder loops [@thooft79] and the confining disorder is located in the centre Z(N) of the SU(N) gauge group. When such a vortex intertwines a Wilson loop, the fields along the loop undergo a gauge transformation that varies from unity to a non-trivial element of the centre as one goes once around the Wilson loop. For SU(2) this means that the Wilson loop acquires a factor of $-1$. A condensate of such vortices will therefore completely disorder the Wilson loop and will lead to linear confinement. At the centre of the vortex, which will be a line in $D=2+1$ and a sheet in $D=3+1$, the fields are clearly singular (multivalued) if we demand that the vortex correspond to a gauge transformation almost everywhere. In a properly regularised and renormalised theory, this singularity will be smoothed out [@thooft79] into a core of finite size in which there is a non-trivial but finite action density, and whose size will be $O(1)$ in units of the physical length scale of the theory. One can either try to study 