DSD and NVB v The Commissioner of Police for the Metropolis  EWHC 2493 (QB), Green J - read judgment
This is an important summary of the principles applicable to HR damages, particularly in circumstances where there have been other payments already made arguably in respect of the acts in question. So it should be first port of call if you have an HR damages problem, not least because it gathers all the learning together.
Green J decided in March 2014 that the police had a duty to conduct investigations into particularly severe violent acts in timely and efficient manner, and that there had been systemic failings by the police in investigating a large number of rapes and sexual assaults perpetrated by the so-called “black cab rapist”, one John Worboys. This amounted to a breach of the of the victims’ rights under Article 3 of the ECHR. See Rosalind English’s post on the liability judgment here