Thanks everyone for the replies.
I contacted the builders this morning, at their request I sent an email outlining the issue along with a very dodgy photo (the best I could do). The receptionist said she would review it and pass it on if necessary (I will assume it will get passed on regardless!).
I know the information is 'somewhere' I will look for it tonight, I was just hoping for some EB feedback. I am pretty sure that it is 25 years for structural defects, but am unsure if this is considered a structural defect or not acording to their definitions.
Twilight, that is great taht they came out and repaired everything after 5 years.
KT1978, we are in Victoria and have had very little rain which I am guessing would have an impact. Our new floorboards (11 months old different company) have shrunk. When I spoke to them the guy said that it was due to the hot days and lack of rain. They are coming out to have a look - I suspect they will not do anything because it may cause damage down the track when we do get rain. There is one area that is pretty bad which I will expect them to fix which, when they see the damage I am sure they will - it will just be a matter of recutting one floorboard, of which I have spare. DH cleaned the gutters out just last week and did not mention any warping etc, I will ask him about it tonight - thanks for the idea.
Thanks again lovely people, I appreciate your comments