Wild Flowers of Chalk and Limestone, J.E. Lousley

First published in 1950 by Collins Clear-Type Press. This description taken from 1969 revised edition. Lewes is in the south-east of England roughly 90km south from London and 10km from the coast.

"Inland there is a fine flora about Lewes with some unusual features. Lewes race-course, Mount Caburn and Mount Harry are among the best places. On the lower slopes of Mount Caburn the Scarce Sweetbriar, Rosa agrestis, is more abundant than in any other place in Britain. For about a mile it is the most common rose, and it is difficult to suggest any reason why it should thrive here and yet be so scarce else where".

And on wikipedia:

"Mount Caburn is now legally protected. It lies within the Lewes Downs SSSI (designated in 1953) and the Mount Caburn National Nature Reserve was established in the mid-1980s. It has been designated a Special Area of Conservation as an example of orchid-rich chalk grassland. It is home to a good population of stonechats.
Caburn is unusual within the South Downs for having a south-facing scarp slope. The site has the largest British population of burnt-tip orchid. There is also the rare small-leaved sweet-briar, and the typical fragrant and pyramidal orchids. Invertebrates include Adonis and chalkhill blue butterflies and the scarce forester moth. Populations of stonechats live in scrubby bushes such as gorse near the golf club and in the valley below, along with other song birds such as blue tits. Herring gulls and carrion crows often fly overhead and hundreds of domestic sheep graze the area. There is a sheltered cave with a water trough where lost sheep can rest safely if they stray away from the flock on a dark night when the farmer is rounding up the animals".