Yes, given this eventuality, the letting agent gave us their forwarding address, so last week I turned up on their doorstep. The daughter answered. I handed her the post and asked whether they moved out on the Easter bank holiday weekend of 31st March. She said, yes they did.

So either her parents are lying bastards or the council has cocked up. I'm hoping it's the latter, and we can just tie this up neatly and move on.