1) depends how long you leave it for if it's just a bit nothing really happens 2) absolutely anything you want, herbs/cheese/olives/sundried toms 3) [[ http://www.butcherbakerblog.com/2008/07/29/cracking-the-tiger-bread-mystery/tiger bread recipe]] 4) your oven has a hot spot, your oven temp isn't as acurate as you think, there was a bit too much sugar in your recipe, the loaf tin you used was a different shape, one of a million reasons, post the recipe for more in depth analysis.
There are LOADS of really good online recipes for bread:
Thank you I use just using the recipe from the bag of flour, but did put in too much sugar, so that explains the burning. The second load look and tasted better but still not as light and airy as I would like, still quite heavy. Will look and try those recipes later