Experimental data on the ambient and elevated temperature tensile and fracture toughness properties of unirradiated, thermally aged and neutron irradiated hot isostatic (HIP) and vacuum hot (VHP) pressed S-65 and S-200F beryllium grades are assessed with respect to the effects of material, test and irradiation variables. The limitations of the existing data are acknowledged and the additional investigations required to clarify some of the present uncertainties are summarised.