Thank you for the advice so far, it's much appreciated. It seems that we've got pretty much everything covered so far, apart from the land registry document... I didn't know that we would need that, my parents don't have the registry document but I just downloaded the form online to send away for an official copy, so that's in hand now.
I suppose I can take out some of the information you said wouldn't be relevant. I just want to make sure I give them everything they need, and some more.
As for the estate agency document... i'm not sure if that will be ok with it being so dated, although it is an original document from 1998 which includes room descriptions and measurements. The only drastic change to the house has been adding a conservatory, so there is actually more room than stated. What would you suggest I include to show that there is no 'risk of overcrowding'?
Thanks again
Andy