How to tell a guest they damaged your worktop

Guests didn't report they burnt my solid beech counter twice. Big black burnt rings from putting hot pans down without thinking, despite there being a cast-iron trivet and large pan coasters left out. They already denied breaking stuff when I asked. I'm worried about a retaliatory review if I tell them the repair is £400, that's the quote. I do not have 'proof' but they did it. All their reviews say they were good guests but fact is they were very disrespectful.

I dont want advice about not having wood counters, please, it's my home, not a rental unit. I will address it with future guests and tell them not to put hot pans on wood.