Shame on you! It has come to my notice that you may not have watched my video on how to avoid being conned on a property transaction. Please do yourself a favour and take a look. It's free and you won't have to stare at my face and hear my voice for very long. Also the music will get you dancing along with an estate agent.
You will discover a way of discouraging gazumping (seller raises price) and gazundering (buyer lowers price) and the terrible porky pies that both sides may tell - there's a lot of it about - as I point you to a lock-out agreement template and an alternative option to purchase.