We wish to exploit the unique capability of Nimrod to move forward the long standing issue of the way in which long chain polymers crystallise. There are two key length scales: the first involves the process of forming thin (10nm) crystals from the melt, and possibility occurs via a separate phase separation process; the second is the local chain conformation (0.02nm to 1nm) this must reorganise to yield a precise symmetry commensurate with the crystalline state. The ability to obtain data over the extensive Q range simultaneously brings new possibilities to this long standing problem and eliminates ambiguities present in the alternative approaches. We will tightly couple the scattering data to computational molecular modelling procedures developed at Reading to extract quantitative parameters which describe the reorganisation of the polymer chains prior to- and during crystallisation.