These fridge-freezers are more common these days, but i still fix things myself - they are rare enough that when we havc had service engineers they've been a bit non-plussed and ive ended up paying for them to learn how to dismantle things.
The flap valve to the ice dispenser broke. So I ordered a replacement and then set about fitting it . I've got a note that i had to do the same in 2007, but didnt record how to do it , so I have now
Remove the water tray and then remove the 2 torx screws.
then you can remove the cover by lifting it off, which exposes the ice maker . remove the screw at the side that is holding the front panel in place
move the slider across and remove the screw on the other side ( I removed the screw holding the slider in place , but its not necessary)
you can then pull the front panel of the dispenser forwards.
bend the water spout out of the way, and you can then remove the old flap from the plastic clip - the other side will have broken off, and replace it with the new one , being careful to engage the lugs on the flap into the plastic clip