Advances over the last decade in computer simulations have made it possible to routinely calculate the collective excitations from disordered materials. These excitations give information on the nature of intermolecular bonding networks, which govern key material properties such as elastic properties, acoustic velocities or thermal transport. Neutron spectroscopy operating in the first Brillouin zone (Brillouin Neutron Scattering or BNS) can access these excitations and validate such calculations. Unfortunately, kinematic constraints and (typically) high background at low scattering angles makes this challenging in practice without significant flux reductions approaching an order of magnitude. Here we describe Brill, a Brillouin Spectrometer proposed for the ISIS pulsed Neutron and Muon Source, UK, which will overcome some of these technical challenges and open up these science areas.