The answer is yes. Even if you have pre-paid your car hire in full in the you will need a credit card when collecting your vehicle. This is for deposit purposes and should have sufficient credit on it to cover the excess. If you don’t have a credit card you should check with your car rental company what to do as they could refuse to give you the car at the car rental desk.
What documents do I need when picking up the rental car?
You will need to bring your driving license (it needs to be the original document) in good condition. If you hold the new style UK or other European licence you will also need your paper counterpart for ID. Failure to do so may result in your car hire company refusing to give you the car. You will also need a credit card for deposit purposes.
What is CDW/LDW? CDW (Collision Damage Waiver), also known as LDW (Loss Damage Waiver)
is car hire insurance which covers damage to the rental vehicle. There is generally an excess payable if you have an accident or damage the car, even if you have CDW
Information from insurance4carhire more from them here