The UK government provided information to the US without seeking assurances that the death penalty would not be sought. That was not only immoral. It was illegal: https://www.deathpenaltyproject.org/uk-supreme-court-finds-governments-decision-to-provide-information-to-the-united-states-to-facilitate-prosecution-for-crimes-carrying-the-death-penalty-unlawful/
AUSTRALIANS AGAINST CAPITAL PUNISHMENT 