Quick question.
Does a seller of a property (estate agent or developer) have to disclose the amounts they have been offered on a property?
nope. why should they?
I thought I read somewhere that by law they had to. That may have only been that they have to say if there has been offer or offers and not to do with the exact amount offered.
You may be mistaking that estate agents must pass on all offers they receive to the seller. The seller is in no way obliged to disclose anything about offers they have received, be it the presence of an offer or the value of any offer.