The chown error is probably a red herring here, I don't think it makes any difference.
What does matter is that your entire website produces an HTTP 410 "Gone" error:
$ curl -ILk sustainablepackaging.uk/
HTTP/1.1 301 Moved Permanently
keep-alive: timeout=5, max=100
date: Tue, 25 Oct 2022 18:49:01 GMT
server: LiteSpeed
location: https://sustainablepackaging.uk/
x-turbo-charged-by: LiteSpeed
HTTP/2 410
date: Tue, 25 Oct 2022 18:49:02 GMT
server: LiteSpeed
x-turbo-charged-by: LiteSpeed
Your website needs to be working before you'll be able to issue a certificate using the webroot method.