Quick question about one of my oak work tops in the kitchen. I lifted the toaster off the surface today to give it a coat of Osmo oil and noticed that there a split/crack in the wood emanating from the edge of the worktop towards the centre of the surface. The split is only a few inches long and at its widest point (at the edge) a few mm's wide but it is a bit disappointing. Is it likely the heat from the toaster that has caused this? Should I do anything about this to stop it getting bigger?? Should it even have happened and I would I have any recourse - it has only been installed for 12 months. Cheers in advance.