Glad you finally got in, OP.
Back in 2003 my late DH and I (just pre-children) had a nightmare move. We were only moving about 2 miles from our flat to first house.
On the completion day our movers turned up, loaded all our stuff, drove over to new house (which was empty as previous owner had already gone but we didn't have keys yet). Then we heard from solicitors that the buyer of our flat had failed to complete in time. Not just their fault but also their dodgy solicitor who had failed to ensure funds were in place.
This was on a Friday. Our solicitors were amazing but it was a right mess. Obviously we couldn't complete on the house either.
It was a whole saga but our solicitor and removal firm couldn't have been more helpful. The removal firm put all our stuff from the van in storage at their HQ. We had to go and stay with a friend while our solicitor put the fear of God into our flat buyer and his solicitor.
Eventually the flat buyer completed the purchase the following Tuesday and our removal firm arranged to move our stuff in that day. Our solicitor made the flat buyer pay a hefty extra sum for our inconvenience, our loss of earnings as we had to take extra time off work, our storage and extra removal costs, inconvenience to the seller of our new house - they made them cough up for EVERYTHING!
We were still a bit traumatised by it all. Luckily our next move 13 years later went very smoothly in comparison!