Welcome to St Mary’s Church, Tadcaster, the largest church in the Tadcaster Benefice, in the Anglican DioceseDiocese A geographical area composed of a number of parishes, under the administrative and spiritual jurisdiction of a Bishop. of YorkYork 1. A Roman city and early centre of Christianity. 2. Diocese and province under the leadership of the Archbishop of York.. We offer a warm and friendly welcome to all and are proud to be an Inclusive Church.