  The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been
measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL
detector at LEP. The D* to D0 pi+ decays were reconstructed both in the
particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive
technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu
transition at zero recoil F(1) was measured to be F(1)|Vcb| =
(37.1+-1.0+-2.0)x10^-3, where the uncertainties are statistical and systematic
respectively. By using Heavy Quark Effective Theory calculations for F(1), a
value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10^-3 was obtained, where the third
error is due to theoretical uncertainties in the value of F(1). The branching
ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.
