It sounds like a file on the website hosting server has been compromised. Whoever administers the site needs to address this with the hosting platform which appears to be 123-Reg
Below, I've copied a response from within the thread in the link:
https://support.google.com/webmasters/thread/3197253/link-to-website-redirects-to-spam-site?hl=enbluequoll
Volunteer Contributor - Google Help Communities
Sep 21, 2019
If a link in Google Search Results redirects, but the website opens correctly using its URL in the browser address bar, the website has almost certainly been hacked with a conditional redirect.
The hack may not be in the website code itself, in which case you won't be able to see anything amiss there.
It's more likely that the hack is in a separate, but legitimate, file named .htaccess on the host server, in the same directory as your website code. Entries in the .htaccess file can control, among other things, basic redirect functionality. In the case of a conditional redirect hack, a malicious entry in the .htaccess can redirect traffic to another site based on the referrer (i.e., which web page the traffic is coming from). For instance, traffic may be redirected to a malicious site only if it's detected as coming from a Google Search results page.
In short, regardless of how this looks, it actually has nothing to do with Google Search results, and is not something that Google has any control over.
If you can't find, or don't have access to, the .htaccess file associated with your website, you'll need to talk with your hosting provider to help sort out the issue.
In any case, for specialized assistance with webmaster/website issues:
Visit the Search Console Help Center or
Ask in the Webmasters Help Community
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Topic: redirecting to a malware site (Read 8221 times)