We will carry out a definitive local structure investigation of the ferroelectric transition in [ND4][Zn(DCOO)3]. This compound is seen as the canonical example of a ferroeletric MOF; yet little is known concerning the structural and dynamical origin of its mechanical behaviour. We will use neutron total scattering, coupled with atomistic structural refinement, to obtain the following: (1) The first comprehensive structural characterisation of the paraelectric/ferroelectric transition, including measurement of critical behaviour in terms of local and long-range order parameters; (2) An understanding of the emergence and role of disorder/order within the ferroelectric/paraelectric phases as the transition is approached from either side of Tc; (3) Measurement of the rotovibrational dispersion spectrum and hence the mode-softening responsible for driving the transition.