We lent a friend a large gazebo over the weekend for a family party. We have had it for a few years but is as good as new. Despite us saying we would come round to take it down once it had dried, they returned it to us yesterday. It’s been raining here since Saturday. Today as it’s sunny we have taken it out and on opening it up can see it’s been damaged. Would I be unreasonable to ask them to buy us a replacement? DH thinks that as we bought it a few years ago in a sale that the replacement would cost them more than we paid. But if they only give us the price of what we paid then we will have to make up the shortfall.