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True - I just said 610mm because it's the next standard door size down! The back door is solid mahogany (I think) so could well be trimmed. The frame would end up looking lopsided - at least from the outside, but maybe that doesn't really matter.
Will get some pics. Thanks for all the advice so far.
BobbyBriggs
Thought you said you only needed 7cm. You could get to 690 by taking 3.5 off each side of your existing door. Pics would be useful though.