what is a note of interest?
Sorry...should have explained...and I may get this wrong!
So, here (in scotland) property is put on the market at offers over. We have open viewings and anyone interested puts in a 'note of interest'. Normally you get a set of 'notes of interest' and once you have enough the estate agent puts a closing date. All the people who put in notes of interest are notified of the closing date and that's when they must put in an offer...if they want to.
The trick is to get the balance right. Not enough notes of interest and there's not a good bidding war...but if you wait to get more then you run the risk of waiting too long and people lose interest
I suppose this might not be the place to ask if people aren't familiar with the system...but I went in to a mild panic at the thought of a closing date and want to ask as many people's advice as possible

I may yet ask the person sitting next to me on the train tonight!