This happened to us. Completed and the agent didn’t have the keys. An hour later, they still didn’t have the keys. We were on the way to the new house, the people who bought ours were already moving in (and of course we were out before completion as we are not idiots).
Estate agent told them they had to drop off keys, now, they did not own the property anymore. They did and we picked them up on the way to the house assuming it was all fine and we could move in.
Nope. Turned up on the drive to see the family though the window watching TV.
The excuse was they were both teachers so didn’t have a lot of time. They had dragged the sale on for 11 months. It was half term the week after - they could have completed then instead.
Our removals guys hauled their stuff onto the drive. The wife was screaming and crying and saying how could they book a van now, it was 5pm.
Solicitors involved, their solicitor told them to remove all their belongings from the property entirely - off the driveway. They ended up putting it all on next doors drive and shifting it all back and forth by taxi.
I posted about it on here at the time and I told I was being unreasonable, that I should have offered to wait and stay elsewhere until the next day, or that I should have helped them move stuff 🤣 Um, nope!