Engine Shed would be converted into a £1.5 million educational centre with a café and an exhibition space about the geology of Portland. Portland Bill Portland Bill is the southern tip of the island of Portland. The Bill has three lighthouse towers. The Higher Lighthouse is now a dwelling and holiday apartments whilst the Lower Lighthouse is now a bird observatory and field centre providing records of bird migration and accommodation for visitors, which opened in 1961. The white and red lighthouse on Bill Point replaced the Higher and Lower Lighthouses in 1906. It is a prominent and much photographed feature; an important landmark for ships passing the headland and its tidal race. The current lighthouse was refurbished in 1996 and became remotely controlled. It now contains a visitors' centre giving information and guided tours of the lighthouse. As of June 2009, the lighthouse uses a 1 kW metal-halide US-made lamp with an operational life of about 4000 hours, or 14 months. Portland Ledge and Portland Race Portland Ledge is an underwater extension of Portland Stone into the English Channel at a place where the depth of Channel is 20 to 40 metres (about 10 to 20 fathoms). Tidal flow is disrupted by the feature; at 10 metres (about 5 fathoms) deep and long, it causes a tidal race to the south of Portland Bill, the so-called Portland Race. The current only stops for brief periods during the -hour tidal cycle and can reach at the spring tide of . Ecology Due to its isolated coastal location, the Isle of Portland has an extensive range of flora and fauna; the coastline and disused quarries are designated as Sites of Special Scientific Interest. The Isle of Portland SSSI encompasses , and includes 17 monitored features ranging from Jurassic fossils, calcareous grassland, rock sea-lavender and nationally scarce butterflies. Sea and migratory birds occupy the cliffs in different seasons, sometimes these include rare species which draw ornithologists from around the country. Rare visitors to the surrounding seas include dolphins, seals and basking sharks. Chesil Beach is one of only two sites in Britain where the scaly cricket can be found; unlike any other cricket it is wingless and does not sing or hop. Ten British Primitive goats were introduced to the East Weares part of the island to control scrub in 2007. The comparatively warm and sunny climate allows species of plants to