  We consider new s-channel scalar exchanges in e+e- -> ZZ,W+W- in
supersymmetry with a small lepton number violation. We show that a small
bilinear R-parity violating term which leads to sneutrino--Higgs mixing can
give rise to a significant scalar resonance enhancement in e+e- -> ZZ,W+W-. We
use the LEP2 measurements of the WW and ZZ cross-sections to place useful
constraints on this scenario. We also find, under conservative assumptions on
the relevant parameter space involved, that such an exchange of the
sneutrino-like admixture in e+e- -> ZZ,W+W- may be accessible to a 500 GeV e+e-
collider.
