Hospital beds in Lewisham and Greenwich NHS Trust were 97 per cent full in the week leading up to the New Year, well above the recommended safe limit of 85 per cent.

Of 822 total available beds, 795 were in use on average between Christmas Day and New Year's Eve, according to the NHS' daily Winter Situation Reports.

The figures show one of these were "escalation beds", temporary beds set up in periods of intense pressure. These are sometimes placed in areas not usually used for hospital patients, such as gyms or day care centres.

In hospitals where more than 85 per cent of beds are occupied, there is a greater risk of patients receiving inadequate care, being placed on an inappropriate ward for their condition, or contracting superbugs such as MRSA, according to the British Medical Association.

While the Trust was operating close to capacity, 22 per cent of beds were taken by patients who had been there for three weeks or longer, while 50 per cent of patients had been in hospital for longer than a week.

Bed blocking, where a patient is well enough to be discharged but unable to leave because the next stage of their care has not been organised, has contributed significantly to A&E delays in recent years.

A small number of additional "critical" beds are available to patients with serious or life-threatening conditions. There were 38 critical beds available in the last week, and 77 per cent of these were occupied.

The winter is always the busiest time of year for the NHS, but Lewisham and Greenwich NHS Trust is under greater pressure than last year, according to NHS figures. In the same week in December 2016, 93 per cent of beds were occupied, four percentage points lower than current rates.

Nationally, 92 per cent of general and acute hospital beds were occupied, while just 16 trusts out of 137 who reported winter data to the NHS met the 85 per cent target over the week.

Responding to the crisis, the NHS has instructed hospitals to delay non-urgent treatment such as joint operations and cataract surgery to relieve pressure on accident and emergency departments.

Chris Hopson, chief executive of NHS Providers, which represents which represents the health service's acute, ambulance, community and mental health services, said: "The trust CEOs we have spoken to and the social media posts we have seen suggest that the NHS is currently under very significant pressure."

"Some are describing it as the most difficult set of urgent and emergency care pressures they have experienced."