Thank you for your reply. This problem has occured several times now and I have had engineers (through insurance) remove the back panel in the freezer compartment and defrost the tray and drainage tube. I have now done this myself but after several weeks the tube obviously freezes up again. and eventually the defrosted water leaking in the bottom of the freezer compartment turns into ice. I was hoping there could be a more permanent solution. Maybe it is a design fault!