The dredger Lange Wapper near Southend this vessel is being used to deepen the shipping channel at the new port of London Gateway
https://www.dredgepoint.org/dredging-database/equipment/lange-wapper
Trinity Quay Wharf opposite the Dome/O2 is London's only lighthouse [not a lot of people know that nor did I until I took this picture on Saturday]
http://news.bbc.co.uk/local/london/hi/people_and_places/history/newsid_8516000/8516036.stm