Hi Rick, thanks for getting back to me. I did try GTmetrix this morning but there was a queue of 700 other websites, although I've just tried it now and it seems to test the site normally. GTmetrix is saying that redirects are minimized, which is different to what the Pagespeed Tester is saying.
I also tested the site in
webpagetest.org and it's saying
https://www.purestaff.co.uk/?sccss=1&ver=4.6.10 is status code 200 as well, so it seems very strange how one tester is saying it's a redirect and another isn't.
I've also crawled the website in Screaming Frog and it's saying that url is a redirect, which is even stranger as depending on where the url is being tested it's coming up as either a 200 or 301.