For those with no Reciept? Repairing 360?

Hi there, long story short, I bought my 360 off Amazon UK about 9 months ago, mainly because it was cheaper and I had comepltely built a new PC in the same month, so I cut a few corners.

However, now I have no reciept to validate the warranty, am I still entitled to repairs from Microsoft? and I assume its not free? or do I have to go to a third party?

I know I have an old model, its rather loud, but naturally with GTA4 around the corner I would like to make shure it is possible for me to get repairs or console replancement off Microsoft?

And if its possible, if anyone can give the UK price of repairs without warranty?

Thanks.