DD stupidly let her BF have the spare key to her car. They broke up and he is refusing to return the key. They went on holiday together, which he put on his credit card. The agreement was that she would pay him back her half in instalments, with everything to be repaid by Christmas. She has paid the agreed amount, but he is saying she can't have her car key back until she has paid everything back. Can anyone advise if this is legal? There were no terms attached to her repaying the holiday money, other than it would be repaid before Christmas - and certainly no condition that he could keep the car key as collateral! Thank you.