If I’ve set up everything correctly, then you should be able to subscribe to this blog in your favourite Fediverse app, such as Mastodon, by following @nrturner@neilturner.me.uk .
You’ll need to install the ActivityPub plugin, and then it should just work where your fediverse username is @your-wordpress-username@your-domain.tld. If you’ve used a plugin to disable author archives, such as Yoast’s SEO plugin, you’ll need to re-enable it for this to work.
I found this guide particularly useful, as it links to Webfinger to test that you’ve set it up correctly.
(Update: since this post was written almost 12 months ago, the ActivityPub plugin has been formally adopted by Automattic and so enjoys wider support)