I'm due to start the Selenium now and I see from my screenshots I need to take it away from food. Is an hour enough? Or do I remember you mentioning 2 hours?

Taking the selenium one hour before eating food should be OK. 2 hours is better, but 1 hour should be OK. I would recommend taking it in the morning after you wake up, and then wait at least one hour until you eat breakfast. That's what I would recommend if you are taking it before eating anything. But if you are taking it later in the day after you have already eaten some food, then I would try to wait two hours after eating and then take the selenium because it will take some time for the food in your stomach to be fully digested.