If you have a WooCommerce store and use the popular Storefront theme, a simple way to add a tagline below the logo is to use the ::after selector.
.custom-logo-link::after { color: #333; content: "award winning jeweller, writer and broadcaster"; display: block; font: 400 1rem 'Oswald', sans-serif; margin-top: 1rem; text-transform: uppercase; }
It’s not really an SEO friendly solution as search engines don’t care what’s inside your stylesheet, but it is a rather neat way to display the logo and tagline together.