Cavendish Wood and Garibaldi Plantation are woodlands adjacent to Spa Ponds, they are not part of Spa Ponds Nature Reserve. The actual boundary of Spa Ponds is as per http://www.foresttown.net/wp-content/uploads/2011/03/FTNCG-Spa-Ponds-Map-for-Website-2017-1.png (including Spa Lane to the north because that is also owned by the Forest Town Nature Conservation Group) - see http://foresttown.net/nature/Spa_Ponds_Overlay.png for a comparison with what OpenStreetMap reports.