We accepted an offer just over a week ago to a chain free buyer. It was not a great offer at 2500 under our lowest price in the guide & 7500 less than I paid for the property 3 years ago, but given the current market, & the fact that it still enabled us to proceed with the property we want I accepted.
Exactly a week to the day of acceptance it transpires that these people are not actually able to borrow the amount to enable them to buy the property. 
We are totally gutted. We were literally about to go & see the vendors of the house we want to buy (private sale) & make an offer, now these people will be putting their house on the open market with an agent.
Feeling really p**d off. :(