  It is a remarkable fact that MHV amplitudes in maximally supersymmetric
Yang-Mills theory at arbitrary loop order can be written as the product of the
tree amplitude with the same helicity configuration and a universal,
helicity-blind function of the kinematic invariants. In this note we show how
for one-loop MHV amplitudes with an arbitrary number of external legs this
universal function can be derived using Wilson loops. Our result is in precise
agreement with the known expression for the infinite sequence of MHV amplitudes
in N=4 super Yang-Mills. In the four-point case, we are able to reproduce the
expression of the amplitude to all orders in the dimensional regularisation
parameter epsilon. This prescription disentangles cleanly infrared divergences
and finite terms, and leads to an intriguing one-to-one mapping between certain
Wilson loop diagrams and (finite) two-mass easy box functions.
