London i s asking people to refrain from using emergency services unless absolutely necessary as the city deals with the strain from hundreds of mourners collapsing in the massive queue to pay their final respects to Queen Elizabeth II.

The United Kingdom's National Health Service said that 435 patients had fallen ill along the mileslong queue, the Telegraph reported. The London Ambulance Service is asking mourners to prepare for the arduous journey through the colossal line in order to cut down on these numbers, which includes preparations such as wearing proper clothing and bringing prescribed medication. As of Friday, the queue was estimated to be 5 miles long, containing citizens from all across the U.K., with an estimated wait time of 22 hours.

OFFICIALS CLOSE OFF ENTRY TO VIEW QUEEN ELIZABETH II'S COFFIN AFTER LINE REACHES 5 MILES

“If it’s cold, it's important people wear appropriate clothing to keep them warm. There will be fixed first aid treatment centres provided by St John Ambulance along the route, supported by cycle and motorcycle responders, medical response teams and ambulances from the London Ambulance Service,” Darren Farmer, the LAS director for ambulance operations, said.

“Our teams are always here to help if you need us, but we would ask that people follow advice, use our service wisely and contact your GP, pharmacy or NHS 111 where possible. Londoners can continue to help us by only calling 999 in a serious medical emergency,” he said.

Farmer added that they are taking extra steps to increase their response capabilities.

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“Over the next few days, we will have about 120 extra staff deployed across our 999 control rooms and on the road, which will rise to 300 extra staff on duty on the day of the funeral (Monday). This will include teams on foot in crowded areas and in our 999 control rooms, to manage the anticipated increase in demand and ensure we reach the most seriously ill and injured patients as quickly as possible," he said.