OK, firstly apologies for the noobness. I was trying to setup Timeshift snapshots and added a line incorrectly for the new subvolume in fstab, so now I can’t boot correctly. I tried to use kate to load fstab and comment out the errant line but have no idea how to actually load the file from kate then edit it. Can anyone advise how I can do this, thanks in advance!
You could use the terminal:
sudo nano /etc/fstab
When you have finished editing press Ctrl-X and answer Y(es) to save.
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you boot on USB live Iso ,
you open a terminal
sudo lsblk -fs
sudo parted -l after you can do a chroot to update /etc/fstab
<chroot>
nano /etc/fstab ( Ctrl + X for save )
sync
exit ( end chroot ) do not forget to update grub or systemd-boot if UUID concerns / or swap
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Many thanks for the quick replies, opening and fixing the file in nano did the job 
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There is another option while using kate. In the File Open dialog box inside kate, there will be a text field “Name”. There enter the name admin:///etc/fstab. You will be asked for password. This will open the fstab file in edit mode using root privileges. It is based on GVFS.
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Kate asks for a password when saving a file that needs elevated permissions.
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Haha you highlighted one issue I have with editing fstab… and whilst I can’t say I completely avoid it, I find it just better to load up gnome-disks…
No more typos 