And its not just Yacht crews. Who do you think gets called if you fall in the Thames? Clue: The busiest RNLI station in the country is Tower, now located just below Waterloo Bridge on the old Police Pier. The three 'E Boat' stations, Chiswick, Tower and Gravesend are, however, professionally crewed (the only other one is Humber) due to the need to meet a 15 min response time. Crews are two professionals and either a third professional or a volunteer (who does two 12 hour shifts a month). There is always a crew on station. Its a strange world however, many RNLI stations have Ambulance staff on the crew, particularly Paramedics (who they are especially keen to recruit) as 'volunteers'.