Thank you Michael, that worked perfectly.
Here is the exact full code of header.php including my changes.
<?php
/**
* The template for displaying the header
*
* Displays all of the head element and everything up until the “site-content” div.
*
* @package WordPress
* @subpackage Twenty_Sixteen
* @since Twenty Sixteen 1.0
*/
?><!DOCTYPE html>
<html <?php language_attributes(); ?> class=”no-js”>
<head>
<meta charset=”<?php bloginfo( ‘charset’ ); ?>”>
<meta name=”viewport” content=”width=device-width, initial-scale=1″>
<link rel=”profile” href=”https://gmpg.org/xfn/11″>
<?php if ( is_singular() && pings_open( get_queried_object() ) ) : ?>
<link rel=”pingback” href=”<?php bloginfo( ‘pingback_url’ ); ?>”>
<?php endif; ?>
<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<div id=”page” class=”site”>
<div class=”site-inner”>
<?php _e( ‘Skip to content’, ‘twentysixteen’ ); ?>
<header id=”masthead” class=”site-header” role=”banner”>
<?php if ( is_active_sidebar( ‘home_right_1’ ) ) : ?>
<div id=”primary-sidebar” class=”primary-sidebar widget-area” role=”complementary”>
<?php dynamic_sidebar( ‘home_right_1’ ); ?>
</div><!– #primary-sidebar –>
<?php endif; ?>
<div class=”site-header-main”>
<div class=”site-branding”>
<?php
twentysixteen_the_custom_logo(); ?>
<?php if ( is_front_page() && is_home() ) : ?>
<h1 class=”site-title”>” rel=”home”><?php bloginfo( ‘name’ ); ?></h1>
<?php else : ?>
<p class=”site-title”>” rel=”home”><?php bloginfo( ‘name’ ); ?></p>
<?php endif;
$description = get_bloginfo( ‘description’, ‘display’ );
if ( $description || is_customize_preview() ) : ?>
<p class=”site-description”><?php echo $description; ?></p>
<?php endif; ?>
</div><!– .site-branding –>
<?php if ( has_nav_menu( ‘primary’ ) || has_nav_menu( ‘social’ ) ) : ?>
<button id=”menu-toggle” class=”menu-toggle”><?php _e( ‘Menu’, ‘twentysixteen’ ); ?></button>
<div id=”site-header-menu” class=”site-header-menu”>
<?php if ( has_nav_menu( ‘primary’ ) ) : ?>
<nav id=”site-navigation” class=”main-navigation” role=”navigation” aria-label=”<?php esc_attr_e( ‘Primary Menu’, ‘twentysixteen’ ); ?>”>
<?php
wp_nav_menu( array(
‘theme_location’ => ‘primary’,
‘menu_class’ => ‘primary-menu’,
) );
?>
</nav><!– .main-navigation –>
<?php endif; ?>
<?php if ( has_nav_menu( ‘social’ ) ) : ?>
<nav id=”social-navigation” class=”social-navigation” role=”navigation” aria-label=”<?php esc_attr_e( ‘Social Links Menu’, ‘twentysixteen’ ); ?>”>
<?php
wp_nav_menu( array(
‘theme_location’ => ‘social’,
‘menu_class’ => ‘social-links-menu’,
‘depth’ => 1,
‘link_before’ => ‘<span class=”screen-reader-text”>’,
‘link_after’ => ‘</span>’,
) );
?>
</nav><!– .social-navigation –>
<?php endif; ?>
</div><!– .site-header-menu –>
<?php endif; ?>
</div><!– .site-header-main –>
<?php if ( get_header_image() ) : ?>
<?php
/**
* Filter the default twentysixteen custom header sizes attribute.
*
* @since Twenty Sixteen 1.0
*
* @param string $custom_header_sizes sizes attribute
* for Custom Header. Default ‘(max-width: 709px) 85vw,
* (max-width: 909px) 81vw, (max-width: 1362px) 88vw, 1200px’.
*/
$custom_header_sizes = apply_filters( ‘twentysixteen_custom_header_sizes’, ‘(max-width: 709px) 85vw, (max-width: 909px) 81vw, (max-width: 1362px) 88vw, 1200px’ );
?>
<div class=”header-image”>
” rel=”home”>
<img src=”<?php header_image(); ?>” srcset=”<?php echo esc_attr( wp_get_attachment_image_srcset( get_custom_header()->attachment_id ) ); ?>” sizes=”<?php echo esc_attr( $custom_header_sizes ); ?>” width=”<?php echo esc_attr( get_custom_header()->width ); ?>” height=”<?php echo esc_attr( get_custom_header()->height ); ?>” alt=”<?php echo esc_attr( get_bloginfo( ‘name’, ‘display’ ) ); ?>”>
</div><!– .header-image –>
<?php endif; // End header image check. ?>
</header><!– .site-header –>
<div id=”content” class=”site-content”>
As you can see I haven’t changed the name from sidebar (home_right_1) which I should do for it to make sense, but now that I know where I should be adding the extra code I can change that.
Many thanks