direct to your inboxNHS bosses have warned Boris Johnson that relaxing coronavirus controls could trigger a third wave of the virus at the busiest time of year for hospitals.In a letter to the Prime Minister, NHS Providers urged “extreme caution” in moving any area of England to a lower tier, according to reports by the BBC.The first review of England’s three-tier allocation is due take place on Wednesday, two weeks after the system was reintroduced at the end of the national lockdown.But areas