Amend previously permitted development as granted under Planning Application Ref 18/1158. Permission 18/1158 provided for enhanced visitor facilities on a site area of circa 19.7 hectares within a total landholding of circa 200 hectares. Works will be in the curtilage of a protected structure, Avondale House. The amended development consists of alterations to the walking trail (comprising sunken walkways, tunnels and elevated timber walkways and lookout over Avondale river), accessible timber lookout tower (overall height 38 metres from ground level) with ground floor level associated facilities, entrance to existing walled garden, landscaping and all related site development works

Amend previously permitted development as granted under P.A. Ref. 18/1158, alterations to the internal site layout, amended café and ancillary facilities, orientation space, covered exhibition space, exhibition/craft space, WC and changing facilities, relocation of service yard, staff parking and relocation and reduced size of electricity sub-station & switch room, provision of disabled car parking area, administrative office, refuse store, fuel store and boiler room, children's play area, external lighting, roof mounted solar panels to new café and orientation space, amended wastewater treatment system, amended storm water system, landscaping to Walled Garden, landscaping and all related site development works