I followed sarabueno’s info and managed to insert it successfully.
my header code now looks like this (with the added code to make the header image
link back to the home page…
</head>
<body <?php body_class();?>>
<noscript><p class="caution aligncenter">Enable Javascript to browse this site, please.</p></noscript>
<div id="container">
<div id="header"><a href="https://blog.trianglecirclesquare.co.uk/">
<img src="https://blog.trianglecirclesquare.co.uk/wp-content/uploads/2010/07/TCS_WEB_LOGO_WHITE.png"></a>
<h1><a href="<?php bloginfo('url'); ?>"><?php bloginfo('name'); ?></a></h1>
<p><?php bloginfo('description'); ?></p>
</div>
thanks sarabueno ??