  We present the complete 2-loop renormalisation group equations of the
superpotential parameters for the supersymmetric standard model including the
full set of R-parity violating couplings. We use these equations to do a study
of (a) gauge coupling unification, (b) bottom-tau unification, (c) the
fixed-point structure of the top quark Yukawa coupling, and (d) two-loop bounds
from perturbative unification. For large values of the R-parity violating
coupling, the value of \alpha_S(M_Z) predicted from unification can be reduced
by 5% with respect to the R-parity conserving case, bringing it to within
2\sigma of the observed value. Bottom-tau Yukawa unification becomes
potentially valid for any value of \tan\beta\sim 2-50. The prediction of the
top Yukawa coupling from the low \tan\beta, infra-red quasi fixed point can be
lowered by up to 10%, raising \tan\beta up to a maximum of 5 and relaxing
experimental constraints upon the quasi-fixed point scenario. For heavy scalar
fermion masses of order 1 Tev the limits on the higher family \Delta L\not=0
operators from perturbative unification are competitive with the indirect
laboratory bounds. We calculate the dependence of these bounds upon \tan \beta.
