The hospital is using a radical new technique, ultra-violet light, to treat skin disease caused by unsanitary living conditions in the East End.

[2] Probationer Ethel Bennett goes through a night of rising tension as she nurses Thomas Hooley, the injured docker whose leg wounds are not healing.

[3] With the hospital facing imminent financial collapse, chairman Sydney Holland launches an inspired campaign to raise money.

[4] Revolution grips the East End as an explosion brings fears of a bomb, and Ethel Bennett and Dr Millais Culpin struggle to control the angry victims.

When detectives arrive, Matron Luckes and Chairman Sydney Holland fear the hospital is in danger of becoming an extension of Scotland Yard.

Meanwhile, Sister Ada Russell battles with irascible star surgeon Mr Henry Dean, whose addiction to cocaine is an open secret.

[5] A scandal brews as Nurse Goodley suspects that Mr Dean is ignoring the terrible side-effects of a new anaesthetic, and battles internally as whether she should risk everything and turn whistleblower.

In the dead of night a sweatshop catches fire, bringing in scores of injured children, and the staff struggle to avert tragedy.

CPR is largely based on the Silvester Method in which a patient's arms are raised above their head and then back down in an effort to stimulate muscles.

Ernest Wilson, portrayed by Jason Watkins, was one of Britain's first radiologists and is shown with burns to both hands due to the unsafe levels with which he must work.