Bismuth based perovskites have been shown display many interesting properties. The field of A site bismuth perovskites gained renewed vigour due to the recent demonstration of the switching of the magnetic field in BiFeO3 by an electric field making it, by some definitions, the only single phase room temperature multiferroic. Given the inersest in BiFeO3 it is somewhat surprising to note that the high pressure phase diagram of the material is poorly understood, with contradictory reports on the number and nature of the phases which exist between ambient pressure and ~15 GPa near ambient temperature. Though above this pressure the presence of a Pnma GdFeO3 type phase is commonly accepted. We intend to investigate these pressure ranges for the first time using neutrons and study the analogous and Bi2M¾Fe½Ti¾O6, together with the high T & P synthesis the new multiferroic BiCo½Ti½O3.