GOV.UK Design Principles
In Paul Robert Lloyd´s Time team: Documenting decisions & marking milestones is a reference to the GOV.UK Design Principles.
The GOV.UK team made beautiful posters for each principle which can be downloaded from GitHub.
I find their principles insightful and truly design led. At first I thought I have favorites, like Start with user needs, Do less, and This is for everyone. But taking time looking at it, now I think each one plays a role to form a holistic space to guide behavior and decisions. I can imagine the team enjoyed working on the principles as well as building digital services. The work carried out by the GOV.UK design system team is outstanding in my view.