Using a switch statement in WordPress

If you wanted to use your switch statement, you could use:

switch ($post->post_name){
    case 'home':
        $content="How much money....";
        break;
    case 'about':
        $content="We design....";
        break;
    case 'services':
        $content="At the....";
        break;
    case 'blog':
        $content="Find out whats....";
        break;
    case 'portfolio':
        $content="Unique, Beautiful....";
        break;
    case 'contact':
        $content="Get in touch to....";
        break;
    case 'privacy-policy':
        $content="How much money....";
        break;
    case 'terms-and-conditions':
        $content="How much....";
        break;      
}

echo '<div class="strapline strap">'.$content.'</div>';

First. I would follow @rrikesh approach of using if/else and use is_page() correctly.

But this code is really inefficient. If you can do an “is_page()” test, then you are on the page, and have access to it’s content. Personally, I would add a custom field to the pages to hold $content. Then on the pages, you can simply call the custom field

$content = get_post_meta($post->ID, 'content', true);
echo '<div class="strapline strap">'.$content.'</div>';

You can use a free plugin like Advanced Custom Fields to quickly add a custom meta field to your pages and your content is easier to organize and edit later.