EC155 helicopter engine start and takeoff at London heliport

The Eurocopter EC155 (now Airbus Helicopters H155) is a long-range medium-lift passenger transport helicopter developed by Eurocopter from its Dauphin family for civil aviation use. Originally designated AS365 N4, the EC155 was developed from the Eurocopter AS365 N3 Dauphin 2 with the aim of significantly increasing the cabin space of the Dauphin.
It is a twin-engined aircraft and can carry up to 13 passengers along with 1 or 2 crew, depending on customer configuration. The helicopter is marketed for passenger transport, offshore support, VIP corporate transport and casualty transport duties.

London Heliport (ICAO: EGLW), previously called Battersea Heliport and currently known officially as the Edmiston London Heliport for sponsorship reasons, is London's only licensed heliport.
The facility opened on 23 April 1959, it is located in Battersea on the south bank of the River Thames a few miles southwest of Westminster Bridge and between Wandsworth Bridge and Battersea Railway Bridge. The heliport, once owned by Westland and then Harrods, is a very small site, it provides a helipad for take-off and landing, and onshore parking for three to four aircraft, depending upon their size.

London Heliport has a fully licensed rescue and firefighting service who are on duty for all aircraft movements at the port as well as providing an emergency response to any helicopter incident within the London area.