We request 4 days on HRPD to perform combined specific heat and neutron powder diffraction measurements of C60 and the molecular hydrogen storage materials, ammonia borane and ammonium borohydride. We are currently developing a heat capacity measurement capability for the ISIS cryostats and wish to commission the apparatus with an initial investigation of the well-studied orientational glass transition in C60 (as a benchmark) followed by measurements on ammonia borane and ammonium borohydride. The in-situ specific heat measurement not only provides a definitive determination of phase transition temperatures but also enforces significant constraints on the crystal structures. Heating is in constant delta Q steps rather than constant delta T enabling the most detailed analyses of the temperature dependence of crystal structures - this will be of general benefit to the ISIS user community.