Hi, I have just been told that there is an invoice on its wayfor goods we received about 14/15 months ago. We had asked for the invoice as soon as we got delivery of the goods but had received nothing. At this stage we thought we wouldn't get an invoice. Can you tell me if I have any argument about the length of time around receiving invoices. It was for heating equipment in the house we built. At this stage I would like to negiotaite the final invoice downwards. At the moment I still don't know what the final amount is as we are due to get it on Friday next?