The Britons - a coach driver and three tourists - were hurt near the coastal town of Middelkerke shortly after 1100 local time (1000 BST) on Sunday 10/06/07.
The coach, from Rotherham-based Leger Holidays, was ending a European tour with 35 passengers and two crew aboard.
The accident happened when the coach swerved to avoid a car and hit a house, causing part of a wall to collapse.
The accident happened between the towns of Middelkerke and Nieuwpoort, near the coastal city of Ostend.
Four people had suffered very serious injuries, including one of the drivers who had had part of his arm amputated.
Neil Lorimer,who heads up Lanyon Bowdler's Personal injury department has considerable expertise in advising victims of overseas coach accidents, Neil Comments "This is another tragic coach accident, my thoughts are with the families and victims of the accident. "
Leger Holidays said three of the 35 passengers involved were in hospital.
The company said one of its two British drivers on board, who was not driving the coach at the time, will remain in hospital.
The remaining holidaymakers have been put up in a hotel and offered counselling, and will return to the UK on Sunday and Monday. Leger staff have travelled to the scene.
Managing Director Ian Henry said: "Clearly our thoughts and concerns go to those still in hospital, to their family and friends, and to the passengers who have been shaken by today's unfortunate accident."
The coach was three years old, and was fitted throughout with seatbelts.
Friends and relatives should call 01709 786502 for further information and check the Leger Holidays website at www.leger.co.uk.