Custom Theme – Banner Appearing, How Do I Remove?

OK so I’ve been developing this site for a week or so and all of a sudden wordpress has added a banner for some reason. I didn’t add this to my theme files and it wasn’t there an hour ago.

The following code is being added somehow:

<div id="header" role="banner">
	<div id="headerimg">
		<h1><a href="http://www.my-site.com/">My Site</a></h1>
		<div class="description"></div>
	</div>
</div>
<hr />

Just really weird as I’m not sure what I changed. I’ve hidden it for now using display none but obviously that’s not ideal.

Anyone know where the code coming from?

Thanks