A critical incident has been declared by University Hospitals Birmingham because of what it says are extreme pressures on services. The first week of January has seen an "exceptional number" of patients with flu requiring hospital admission, which has now affected 311 inpatients, the NHS trust said.

Here’s a list of which hospitals we know have declared a critical incident so far: Basingstoke and North Hampshire Hospital, Hampshire Hospitals NHS Foundation Trust Royal Liverpool Hospital, Liverpool University Hospitals NHS Foundation Trust Good Hope Hospital, University Hospitals Birmingham NHS Foundation Trust

The number of patients on wards with flu increased by a fifth from 4,469 at the end of December to 5,408 last week, NHS data showed. Analysis of the figures has revealed the average number of patients on wards at each NHS trust in England.