South Thames Estuary and Marshes are nationally scarce plants on dykes, and the diverse invertebra include nationally rare beetles, flies and true bugs. South Thames Estuary and Marshes South Thames Estuary and Marshes is a biological Site of Special Scientific Interest which stretches between Gravesend and the mouth of the River Medway in Kent. Part of it is a Nature Conservation Review site, Grade I, and part is a Royal Society for the Protection of Birds nature reserve. It is part of the Thames Estuary and Marshes Ramsar internationally important wetland site and Special Protection Area under the European Union Directive on the Conservation of
Sheppey Light Railway remote Hundred of Hoo branch on the other side of the Medway estuary. A further six were acquired in 1906 for use on other lightly used services. The railmotors remained in use until the outbreak of World War I. The steam engine components were scrapped but the carriage portions were united in pairs, coupled over a shared bogie, and in this format they remained in use on Sheppey, hauled by normal steam engines, until the line's closure. As the steam railmotors did not have enough power to pull goods wagons, the SE&CR sought out a small engine for the daily