I find the best car hire option is to use my credit card (which has a pretty high limit), and allow the car company to take a block on whatever amount they like. I don't know if all companies would be equally happy to take a debit card (but even if they do, I guess it'd mean you have to have a large amount of cash in your current account).
Also, I'd never buy insurance from the rental company - costs a fortune. Something like Blue Insurance's Car Hire Excess is much better value (and I've claimed against it without issue previously). It means you don't have to worry about how (un)trustworthy the hire company is.
Also, I'd never buy insurance from the rental company - costs a fortune. Something like Blue Insurance's Car Hire Excess is much better value (and I've claimed against it without issue previously). It means you don't have to worry about how (un)trustworthy the hire company is.