Duplicate title / description tags

My description tag is a duplicate of the title tag of my pages. Also, the description tag tacks my site’s title onto the end of it, so I have the title tag in there, followed by the ‘Tagline.’

I have the SEO Yoast plugin and no force rewrite ticked as that doesn’t make a difference.

In header.php I have the following code:-

<meta name=”description” content=”<?php wp_title(); echo ‘ | ‘; bloginfo( ‘description’ ); ?>” />

I’m thinking that there is something I should be changing in there to force it to see my Yoast description and also not use the Tagline too?

Any help gratefully received.