Before moving into my house, I had it completely rewired and a dusk to dawn light put in the hall, so a light would go on during hours of darkness even if the house was unoccupied. It lasted for 11 years. Three days before I moved out, leaving the house empty and awaiting sale, it stopped working.
I would approach the buyers and ask if they want you to replace it - you can say that you've got the part on order and not tell them the cost, but say that its cracked and you'll replace it if they request it but obviously won't if they're going to remove it anyway?
I say this because our new neighbour crashed into our boundary wall between exchange and completion. In a panic, he and the seller paid several thousand to repair it. I still haven't gotten round to telling them that I wish they hadn't as we're removing it anyway.
Or, don't mention it and see if they raise it when they move in. You can always blame the movers....
It might be worth contacting the purchasers to let them know. It could be that they were not planning on keeping it anyway, or they might prefer it to be replaced with something else less expensive. You never know, you might be lucky.
My own sod's law is that the very day we finally got an offer on our house was also the day that the only property we liked and could afford in the location we want agreed a sale. Can't decide what to do next.
Thanks all. I have told our buyer, and asked what their intentions were. They want it replaced. We don't have the time, so I have to give them the money. It's only fair, to be fair. Still outraged at £800 on a table we will never use.
On moving day, we noticed a smell of gas in the kitchen, but figured it was because of all the stuff we'd moved in the kitchen. We went back for some post (and the screws from DD's bed) and found out that not only was the gas pipe to the hob badly welded, there was a damaged gas pipe under the driveway. At least we had a gas safety certificate so the new owners could claim the cost of fixing the hob! The house we bought had its own (numerous) issues, so we didn't feel too guilty about ignoring the gas smell.