They always find damage with them when you return them I’ve heard that story many times,you’ll get a far better deal buying 1 through your bank.
This is why its important to get a booklet from them explaining how they determine the difference between fair wear and tear and actual damage.
If they won't give you this info then its time to find another finance house that will.
Quite a while back my late brother in law rented a luxury 4 x 4. Their criteria to determine damage was using a 20p piece. If the damage, say a stone chip was smaller than a 20p piece then it was classed as fair wear and tear. But we only found that out by asking for the booklet.
For example; Leaseplan provide a detailed 'fair wear and tear' guide for cars and a separate one for vans.
https://www.leaseplan.com/en-gb/my-lease-vehicle/return-your-vehicle/ I used to deal with a finance house who were absolute sticklers for charging for every stone chip. It was cheaper to call in a chip and dent repairer to fix them before returning the car to save their customer money. It was all a money making racket as most of the returns went directly to auction. A couple of stone chips wouldn't have made any difference to the auction price.
The other trick is on hand over to make a point of visibly taking detailed hi resolution photographs of every panel of the car/van when handing it back. Also take detailed photos on the interior and instrument panel with the engine running and mileage indicated.
Take a photo of the vehicles service book with each service completed.
Once the vehicle is out of your sight then you have no recourse. They can however claim for stuff they later 'find' in their 'workshop' missed at the initial inspection.
Personally having worked in the trade I would certainly hesitate to lease a vehicle as a sole trader. I would most certainly not take a vehicle on Contract Hire because the risks are too highly loaded against me.