Refusals to modify and lift conditions on existing planning permission - Council`s applicaiton for confirmation of Modification Order - Structure and Local Plans - whether permission had lapsed - `material operation` - proposed car park - applications within period for commencement of development - whether any change of circumstances justified extending commencement period - validity of condition - whether car park, or its deletion, would be harmful - whether development would be harmful - Modification Order not a material change until confirmation - traffic mission should be revoked - area of Great Landscape Value - amenity of nearby building - change of use to museum and tea room - conditions. Costs - differing criteria as between planning applications and applications for Modification Orders - in planning applications awarded against a party only on grounds of his unreasonable behaviour - in Modification Orders awarded to successful objector unless there are exceptional reasons fo