It is estimated that most patients will still be treated at the new centre

The unit at Crawley Hospital closes its doors at 2100 BST on Sunday.

Patients suffering from acute problems will have to travel to East Surrey Hospital, in Redhill.

Some people have expressed concerns about having to travel further for emergency treatment, but they have been promised "the best possible care".

The closure is part of a �30m overhaul of services.

It is estimated that 75% of patients - those with less serious injuries and ailments - will continue to be treated at Crawley Hospital at the new walk-in centre.

'Years of planning'

Work will begin on the new purpose-built �1.2m centre in October.

Until then, it will be based at what was previously Crawley Hospital's A&E department.

Ken Cunningham, chief executive of the Surrey and Sussex NHS Trust, said it was the culmination of years of planning.

"It means that patients who are acutely ill can receive care from specialist teams who will provide comprehensive care around the clock at East Surrey Hospital," he said.

The move has not been without controversy.

Unison, representing Sussex ambulance crews, has voiced concern that it feels the changes mean too much pressure will be put on the hospital in Redhill.