NB. A day later. After a little more research on the web, and after being told an interesting tit-bit of information by a colleague, it seems that Winston Churchill may have introduced the Black Swan to Blighty, at his country residence, Chartwell.
Lifted from the web:
"Out in the garden is a small lake with an island that Churchill helped to build himself. Unusually for England there are black swans resident in the lake. The original swans were a gift to Churchill from the people of Australia in recognition of his wartime achievments. He was very proud of them and their successors are there today".
The Black Swan means "Perth" (Western Australia) to Australians, in the same way that the Kangaroo means "Australia as a whole". There is an ancient Western Australian legend that explains the origin of the Black Swans. Allegedly a pair of White Swans stole some Eagles' boomerangs. The Eagles were so furious that they plucked those White Swans alive. Their blood stained their bills, and so concerned were the local Crows, that they covered the Swans in their own black feathers...