  For $\Gamma$ a group of order $mp$ for $p$ prime where $gcd(p,m)=1$, we
consider those regular subgroups $N\leq Perm(\Gamma)$ normalized by
$\lambda(\Gamma)$, the left regular representation of $\Gamma$. These subgroups
are in one-to-one correspondence with the Hopf-Galois structures on separable
field extensions $L/K$ with $\Gamma=Gal(L/K)$. This is a follow up to the
author's earlier work where, by assuming $p>m$, one has that all such $N$ lie
within the normalizer of the $p$-Sylow subgroup of $\lambda(\Gamma)$. Here we
show that one only need assume that all groups of a given order $mp$ have a
unique $p$-Sylow subgroup, and that $p$ not be a divisor of the automorphism
groups of any group of order $m$. As such, we extend the applicability of the
program for computing these regular subgroups $N$ and concordantly the
corresponding Hopf-Galois structures on separable extensions of degree $mp$.

Group Theory;Rings and Algebras