BiFeO3 is the most widely studied multiferroic and rare earth doping overcomes problems associated with phase metastability and leakage which have hampered applications. We propose a follow up study to RB1110072 which aimed to identify the crystallographic phase fields for La- and Nd-doped BiFeO3; the La-system proved to be interesting and consequently took most of the allocated time. We wish to extend the work in two directions: 1) data for Bi1-yLayFeO3 (y = 0.4 and 0.5) shows the Pnma phase to exhibit an increasing orthorhombic distortion upon heating. This is very unusual behaviour worthy of further study, we therefore propose to extend the temperature range studied beyond the magnetic transition (circa 680 K) to determine if this behaviour is linked to magnetism. 2) study of Bi1-xNdxFeO3 for analogous behaviour andto confirm the reported antipolar Pbam phase.