You have it John Walker, though Pete has the correct name of the Saint. It is indeed the pond at The Bayle, Folkestone. Previously known as St Eanswythe's pond, this body of water, which when this pic was taken in the late nineteenth - early twentieth century had already been reduced in size, was fed by an artificial waterway known as St Eanswythe's Water. This took fresh water from a spring at the base of the Folkstone hills (near the nineteenth century waterworks reservoirs) and transported the water across the Pent Valley, crossing the Pent Stream, and into the heart of the medieval town. Assumed to have been originally created by St Eanswythe in the mid seventh century, her miracle was to make water flow uphill to the area know known as The Bayle. Known to have been the area of an early Anglo Saxon minster foundation, the site of the pond is actually approximately 75m from the cliffe edge overlooking the site of Folkestone's nineteenth century pier. Sadly, the pond was further reduced to a 'Blue Peter' sized pond in the mid - late twentieth century, but was supposed to have been fed by the natural spring water well into the early twentieth century.
Over to you John Walker with a mention in dispatches to Pete.