This guide from the Department for Communities and Local Government is a useful introduction to the planning system.
A suggestion has been made by Breckland Council that Yaxham be designated as a Local Service Centre. This idea (not a proposal) is contained in the "Local Plan Issues and Options counsultation responses and progress report" by Iain Withington which was discussed at Breckland's Local Plan Working Group on 20th March 2015.
The report can be read in Public reports pack here.
The relevant items are 1.36 to 1.55, particularly 1.51.