With SEO, you can never be certain. Since I don't have firsthand experience in it, I can't promise anything and neither can anyone else who doesn't(have firsthand experience). However, it never hurts to try. It's all about giving google the correct signals and hoping it picks up on them and it is what it's looking for.

I personally prefer Ahrefs due to the more frequently updated and larger sized index, plus the interface and graphs are great.

If they have only dropped on google.co.uk, while I don't have personal experience with it and it's just theoretical hear-say and common sense, google has been moving in a direction to personalize search results even more, in which case it might be explained by your small percentage of backlinks from UK websites. (https://ahrefs.com/site-explorer/overview/subdomains/onedirection.net)

You can do a press release targeted to UK, and see if that makes any difference. Make the Press Release LSI related to one direction, UK, and have your website mentioned in there, preferably in a link and in a sentence containing UK.

Did your rankings just start falling for "one direction" or related keywords as well?

I've noticed recently that google has started "penalizing" websites for specific keywords only, leaving the remaining keywords untouched.

I took a quick peek and your backlinks for "one direction" at a domain level are higher than "onedirection.net". I'd try and fix that by getting the anchors changed or building new links.