CLEAN : Johnson: UK to remain in contain phase of coronavirus response

The video outlines four phases in the approach to tackling the virus: contain, delay, research, and mitigate. Currently, the focus is on containment, but due to global developments, scientists believe containment alone is insufficient. Therefore, preparations are underway to transition to the delay phase.

What preparations are being made for the next phase?

What does the delay phase involve according to the text?