Traditional high-temperature synthesis techniques can be used to vary the composition of K{1-x}Fe{2-y}Se2 up to certain limits. We have found a way to extend the limits on the K occupancy, x, namely by using a soft-chemistry method to deintercalate K from in between Fe{2-y}Se2 layers to leave an Fe-deficient magnetic ¿22¿ compound unobtainable via other synthetic routes. This allows us an unparalleled capability to tune between magnetism and superconductivity over the full range of x values. We can also vary y using high-T methods and dope on the Fe site with Co, which has proved to be a very successful technique with other materials we have studied at ISIS. We then have three distinct ways of varying composition and, in this experiment, we wish to explore the resulting phase diagram of this novel set of materials.