Brownsea Island It is within the South Dorset constituency of the House of Commons and the South West England constituency of the European Parliament. Brownsea Island has built up on a bare sand and mud bank deposited in the shallow harbour. Ecological succession has taken place on the island to create topsoil able to support ecosystems. The nature reserve on the island is leased from the National Trust by Dorset Wildlife Trust. This reserve includes a brackish lagoon and area of woodland. Other ecosystems on the island include salt marsh, reedbed, two freshwater lakes, alder carr, coniferous woodland, deciduous woodland and arboretum.
Brownsea Castle of the 20th century, using it to house his collection of antique musical instruments. Brownsea Castle was purchased by Mary Bonham-Christie in 1927. She allowed the property to fall into disrepair and by the time of her death in 1961 it was in a very poor condition. It was then purchased by the National Trust and leased to the John Lewis Partnership, who restored it over many years. In the 21st century it is still used by the Partnership as a corporate hotel for their employees and retired staff. Brownsea Castle was built as a consequence of international tensions between