The most prominent members of the spin-ice group are Ho2Ti2O7 (HTO) and Dy2Ti2O7 (DTO), in which magnetism arises from localised rare-earth ions with a strong crystal-field anisotropy. These exchange interactions lead to the exotic behaviours which, in the case of spin ice materials, includes residual entropy, magnetic monopoles and a Coulomb phase. Neutron scattering has been significant in the determination of these exotic states. Under applied pressure, spin-ice compounds on the pyrochlore lattice are predicted to display exotic magnetic behaviour that included an infinite-order multicritical transition between a Coulomb liquid phase and an ordered magnetised state. Recent susceptibility measurements on DTO reveal strongly enhanced antiferromagnetic correlations upon the application of hydrostatic pressure. This proposal aims to quantify these magnetic correlations using polarisation analysis on the diffuse scattering spectrometer, D7.