AVOID
I had a courtesy car paid for through the insurance as someone had crashed into me. 
They gave me a smart car . I recieved a phone call saying they had to change the car. We arranged for them to collect the car. 
The guy came to veiw the car and said to me there is a scratch which  is soo small it would be seen as ware and tear.  So  i signed it not thinking any thing of it.
Around half an hour later I had a phone call from the company saying that they would have to charge me because even though the scratch was small you could fit a finger nail in it. 
He then asked me when would i like the money to come out of my account. 
I said for him to take it out the following weds. He then said well the thing is charge will be put on to your account straight away.
Well what was the point in asking me? The money they took was my gas and electric for that week and food money.
I then told them to come and collect their car as i can't afford for them to take charges just like that.
When they came to collect the car he tried to say the tank was not full. I had the car less then 24 hours and did the school run which is 1 minute away in car. That is hardly going to use any petrol.
I refused to sign and the company said they will not charge me for the petrol not being full. 
Obviously they couldn't as they had already scammed me the day before.
I suggest you DO NOT sign anything unless you are responsible for any scratches caused. Do not fall into their trap of wear and tear. 
Sorry about spelling.