I'm not sure of the relevance of this, but as part of the transitional arrangements from the old Local Plan to a new Local Development Framework (LDF), the Local Plan expired on 17th June 2009 and only those policies that have been saved by the Secretary of State's direction will continue to be part of TDC’s Development Plan.
The policies relating to Heritage that HAVE NOT BEEN SAVED
include the following:
HE1 - LISTED BUILDINGS OF SPECIAL ARCHITECTURAL OR HISTORIC INTEREST
HE2 - CHANGE OF USE OF LISTED BUILDINGS
HE4 - PLANNING CONTROLS IN CONSERVATION AREAS
HE5 - CONSERVATION AREA CONSENT
HE6 - DEMOLITION IN CONSERVATION AREAS
HE7 - NON-LISTED BUILDINGS IN CONSERVATION AREAS
The Local Plan (as amended) can be read here: http://thanet.devplan.org.uk/
It appears the ability of the Council to consider this application from a Heritage point of view has become extremely limited as a result of deleting these policies. Following a call to the council it appears that until anything more specific is written into the new Local Development Framework, protection for heritage sites comes from the Communities and Local Government section of central government, and in particular Planning Policy Statement 5: "Planning for the Historic Environment" which can be found here: http://www.communities.gov.uk/publications/planningandbuilding/pps5
. Having had a quick look at this it appears far less specific in its policies and doesn't appear to offer anywhere near as much protection as the now expired Local Plan did.