Back before TDS was invented my landlord:
Hadn't moved out himself by our moving in day. We got given keys and unlocked to find a fully furnished, messy flat with unmade beds, clothes on the floor, old food in the fridge, and a decent size pot stash complete with rizla in the living room
WE packed up all his stuff then gave him a day to move it out. Not even a thank you
We bought our own beds as he took his. He then claimed £££s off our deposit for the beds we'd stolen 
He claimed money off our deposit for mouse treatment needed after we moved out, saying the flat has never had a rodent problem. Luckily we had taken photos of receipts of rat poison treatment pinned up in the kitchen before we moved in
He claimed a lot of money off for cleaning, even though we had photos of literal mould frozen into the back of the manky old fridge which we'd cleaned off, and mountains of crumbs in the kitchen etc, as well as normal dirt from a single man living in a flat on his own who them went on a mo th long holiday and hadn't cleaned up beforehand
The crooked estate agent wankworth I'm looking at you then conspired with him to sell the flat while we were wrangling over the deposit with their own lettings dept, so one day he'd just moved to Spain with our £2k deposit. Short of applying for his extradition there was nothing we could do.
Still angry about this 15 yrs later.
I occasionally Google him. He's a vaguely known song writer, think he won an Ivor Novello. If he ever becomes well know I will go to the papers with this story and try to get my money back, cunt
So glad the TPS came in, but clever landlords still find a way round it to be bastards
I'm a landlord at the moment - short term necessity, and I've been bloody brilliant. If anyone wants to send their arsehole landlords to me for advice on how to treat tenants with respect and decency please feel free