If deposit is not in DPS I believe there are swingeing penalties for the landlord.
I moved out of my previous place in December, having been there for 6 years. The landlord claimed over £1200 of “damages” from the deposit re dirty carpets, filthy fridge, etc…
The DPS ruled that while it was doubtless grubby when I left, it was also grubby when I arrived…
Landlord was awarded £50…