We sold our house STC in April this year. There were problems and delays due to the property we were buying being held up in probate. As soon as probate had been granted, we pushed for a completion date. My OH in his wisdom was so fed up he gave the solicitors a 'final day' for completion (bear in mind this was our dream property, and in a location where properties don't come up very often - and we didn't want to lose it). At last, everyone was in agreement (there was a chain below us) and it was decided we would exchange & complete on the same day.
There followed a few days of frantic packing, cleaning, etc. THEN, the day before we were due to move, our buyers, buyer dropped out - just like that!
I know they were within their rights to do so, as they had not signed the contract, but seriously (!) we were devastated. Half our old furniture had gone to the tip, even our oven had gone as it was very old, and everything else was in boxes.
We had no choice but to put it straight back on the market, and luckily it sold again within a week to a 1st-time buyer, and we completed on 20th Sept - we have been in our new home for a week now and LOVE IT.
We did not know the reason the other buyer in the chain dropped out - and luckily, we sold again quickly.
We have moved into a quiet area, and this week there have been several building jobs going on, all with noise (obvs) but we are just glad to be in our new home. As a previous post said, the bank will not lend more than the property is worth, and also, if house prices go down, they go down everywhere generally.
Sorry, this was much longer than planned!