The aims of the experiment are (1) to obtain structural data for the model hydrogen storage intermetallic LaNi5 under a deuterium pressure of 3000 bar at cryogenic temperatures, in response to our recent discovery that LaNi5 absorbs excess hydrogen well beyond the known maximum of LaNi5H6.7 when exposed to 2000 bar H2 while cooling to 80 K; (2) to commission the new 4000-bar Inconel cell developed for EMG by ISIS; (3) to continue the collaboration with ISIS on the collection and analysis of TOF powder diffraction data using a thick-walled (gas) pressure cell, specifically to obtain data to allow us to incorporate wavelength-dependent attenuation owing to Bragg scattering by the cell and sample into the attenuation correction procedure for the sample diffraction profile.