The UK Three Step Approach - What Is The Purpose?

We sit down and discuss the UK's new approach to tackle the coronavirus. What are the three steps that have been introduced? What is the purpose? Also, how ridiculous are the rules that are being put forth? Will people follow them? And, stores are beginning to reintroduce rationing? What products can you expect to see restrictions on? How will this affect behavior going forward? We ask the question, Is there really any purpose behind any of this?