  A high energy ep collider, such as the proposed LHeC, possesses the unique
facility of permitting direct measurement of the HWW coupling without
contamination from the HZZ coupling. At such a machine, the fusion of two W
bosons through the HWW vertex would give rise to typical charged current (CC)
events accompanied by a Higgs boson. We demonstrate that azimuthal angle
correlations between the observable CC final states could then be a sensitive
probe of the nature of the HWW vertex and hence of the CP properties of the
Higgs boson.
