Removing the panels was simple enough and it was indeed then easy to replace the temperature sensor. It wasn't long before I had the whole thing back together again and Clare helped me put it back in place. Unfortunately, the error code still shows! While I was inside the oven I took a look at the control board too. It will be more fiddly to replace, but it should just be a case of moving all the connectors from the old to the new. I've ordered one, so we'll see.