I agree with those who say you have a choice. I had my last one keyed whilst parked in London. Motability said they had no issues with leaving it as it was, but like others I wanted it done.
They happily agreed and I paid the £100 and had a courtesy car for the week it was in.
Came out looking brand new. They even did a different slight dink “whilst we had it” that wasn’t included in the quote (free of charge) that was barely noticeable.