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.

I guess you should use if and else instead of a switch.

is_page will just check if you are on a page and will return true or false. It will not return your page name.

What you need to do:

if ( is_page('Home') ){
  #do home stuff
}
elseif( is_page ('about') ){
  #do other stuff
}
elseif( is_page('services'){
  #do services stuff
}

Look at is_page for parameters you can pass.

is_page() is a boolean function, it only returns true or false.

You might find using $page = get_the_title() a reasonable alternative.