Sea Monster in Tooley Street

In Mark Pilkington's recent talk at South East London Folklore Society, he suggested that military agencies had sometimes deliberately played along with UFO and related stories as a cover for their own clandestine activities. For instance he talked about the Lake Pend Oreille Paddler, Idaho's very own Loch Ness Monster, which just happens to frequent a lake used for many years for secret US submarine tests.

All of which makes me wonder, why is this particular sea monster in a flower bed in Tooley Street, SE1? Is it part of a plot to disguise dubious goings on in nearby City Hall? I think we should be told.