My copy of the Customary of Our Lady of Walsingham just arrived. I look forward to inspecting it in great detail in the coming days. As I understand it, the book, though it bears the Imprimatur of Msgr. Keith Newton, the Ordinary, is a private work, not permitted for public worship, nor was it compiled in concert with Anglicanae Traditiones, the commission charged with developing the official liturgical texts for the Ordinariates. Even so, being (wholly?) the product of Msgr. Andrew Burnham, it should prove quite enlightening and edifying.