Bifold Door not Sliding in Walthamstow

The bottom hinges on this bifold door in E17 Walthamstow is dragging along the bottom when opening and closing. The bottom wheel hinges have slipped and become misaligned over time. The doors will need to be raised and realigned. Also there is an issue with the runners. The floor underneath the runners has lowered meaning that the track will need to be raised and straightened for the bifold doors to run correctly.