Three different shops and four different freezer flaps later and I have finally managed to secure the correct freezer flap to replace the broken one. This is a major victory marred only by the fact that the freezer flap is BLUE so does not match the others. However, it fits and that is all that matters.
In other online shopping news, I bought some lightbulbs because a lightbulb in the kitchen had gone. They arrived today but looked a bit dodgy. I installed one and it almost immediately exploded, showering the kitchen in glass. This was most disconcerting. However, I immediately complained to the company and within 15 mins had all my money refunded. Online stuff is annoying AND good.