Repairs to Old Style Aluminium Doors in Dulwich

Old style aluminium sliding door Dulwich SE21. 

The back panel of the main sliding door has come away exposing the glass panel so it needs to be fixed back.

The doors are are very old so the holding screws may have deteriorated. Therefore the panel has come away whilst the door was being slid back and forth. The door panel will need to be removed in order to repair