The amorphous ices are good model systems for the study of pressure amorphisation and provide our princpal experimental test of the two liquids model of water. This seeks to explain the anomalous properties of water by the existence of second critical point in the inaccesible supercooled region of the phase diagram. Recent studies have revealed that the behaviour of high density amorphous ice (HDA) is extremely complicated and that there are at least three subvarients of this amorph. This proposal is for beamtime to study the transition between two of them, expanded HDA and very high density amorphous (VHDA) ice, in order to confirm our provisional conclusions based on recent work VHDA is is NOT a distinct 'phase'.