Thank you , it worked.
But whilst in terminal I was also given two error messages. Maybe though these are unimportant, although if that is so then why would the information be flagged?
See below
Simon
The directory '/home/simon/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/simon/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.