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Second, it is unclear how much of Britain's inflation premium over other countries represents a time-lag - partly due to a different timing of energy subsidies - rather than persistent inflation pressures.

Though the growth of new cases has slowed in recent days, hospitals are still bracing for weeks of many new admissions because of a time-lag between diagnosis and possible need for hospitalization.

Because there will be a time-lag before it updates, anyone who has been advised to isolate by the app can leave isolation if their countdown timer hits three days between Monday and Thursday.

"We know that public confidence at returning to indoor events and performances is low - we have all seen the statistics on the low appetite for booking for future arts events, and the alarming time-lag there may be before even bookings are considered," the document said.

Government figures are usually released with a time-lag of several weeks.