I think i stuffed-up. I assumed i cold edit it with gedit instead of vi but after saving with gedit then noticed that both you and the file say i must only use visudo for this. so i opened with visudo and saved again. Also i noticed the sections
## Installation and management of software
## Allows members of the 'sys' group to run networking, software,
## service management apps and more.
And added the line
user ALL=(ALL) ALL
to the end of each of those. At least this fedora is not the only Linux operating system on my machine so if i have stuffed-up i should be able to copy my back-up back over the original, hopefully!
Thanks and regards from