There was a fashion in the late eighteenth century led by Capability Brown and others to plant them either directly outside country houses or as a key part of their landscaping plans for the gardens.
Two other cedars commonly seen in London especially in parks are the Atlas cedar C x. atlantica and the Deodar cedar C. deodara. Like all true cedars they can be recognised by their small rosettes of leaves.
The third cedar of this small group of only four true cedars is the Deodar cedar C. deodara. It is quite different from the other two being normally pyramid in shape, with drooping ends to its branches and a drooping leader. Cedars are often just quickly separated by their branching alone, upward indicating Atlas, horizontal Cedar of the Lebanon and drooping Deodar.
Sadly in Britain they only reach between a third or half of these heights and far, far less in London. The odd-looking coastal redwood beside the bowling green in Battersea park has grown just a metre or two in the last forty years.