Yep as others have said photo everything, don’t forget the electric and gas meters, my last rental I told the landlord there’s a standing charge through British Gas, I showed him the money keys and gave him a local map where he could buy gas and electric, I left the meters with £2 on each, would of lasted a week.
When I tried to claim my deposit it took a month for the agents to get it going as he refused there calls, then disputed we left the gas electric in arrears of £30 on both, turned out he hadn’t added any money and it ran over. The estate agent refused my deposit and claimed an admin fee etc.. i went in and showed my time stamped photos on leaving day, not too happy they authorised my deposit return and claimed there expenses off the landlord.
Reason I went through this, was the original agreement was with his wife it was her flat but he got it in the divorce, it was the first time he had seen the flat in the 10 years we lived there.