  The Wegner orbital model is a class of random operators introduced by Wegner
to model the motion of a quantum particle with many internal degrees of freedom
(orbitals) in a disordered medium. We consider the case when the matrix
potential is Gaussian, and prove three results: localisation at strong
disorder, a Wegner-type estimate on the mean density of eigenvalues, and a
Minami-type estimate on the probability of having multiple eigenvalues in a
short interval. The last two results are proved in the more general setting of
deformed block-Gaussian matrices, which includes a class of Gaussian band
matrices as a special case. Emphasis is placed on the dependence of the bounds
on the number of orbitals. As an additional application, we improve the upper
bound on the localisation length for one-dimensional Gaussian band matrices.
