In reply to Gile5:
I use drivalia.
Here's their reply to an email I sent them;
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When you pick up the car you can pay with a debit or credit card , what you prefer and I have see that you also take the extra coverages, then you don´t need to pay a deposit and we don´t blocked money on your card , it´s only when you don´t take the extra coverages then we blocked the money on the credit card and also you pay with credit card.
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So I guess they do block if you don't pay the extra €6.50 or so/day.
Matthew
