Hi
Just FYI... I have told Google Manually by giving it the link: https://[redacted].co.uk/sitemap.en-GB.4seo.1.xml.gz
Please don't do that, you should remove this from Google. This is just a partial file
Google definitely isn't able to read the XML file itself.
The main sitemap file is perfectly readable, you can test it yourself in your browser. What makes you think Google cannot read it? have you seen an error message saying they can't read it? if they were not able to read it, there would be an actual error message with an error code.
The only issue I see here is that someone added the "Crawl-delay" directive to the robots.txt, which is not supported by Google. I can't say if this is causing an issue but I would definitely remove it anyway, just to be sure.
Best regards
Yannick Gaultier
weeblr.com / @weeblr