Does anybody know how to set this? The default is set to 12 but I want to use 18 and each time I add to my document I have to highlight each new area of text and change it manually.
Only a small thing but added to the need to scroll right down from the top of a very long document each time I revisit, it is really tiresome.
Help does not seem to be much err help. 
IS this any good?
It certainly seems to be, thank you, the proof will be the next time I log on and add text to my document. 
Any idea about avoiding scrolling down to the end of a, at the moment, 76 page document?
Is there some way I can simply pick up where I left off?
I’ll check your link myself but you might have the answer sooner. 
Some notes here but it seems a bit of a faff.
Or you could hold down ctrl-shift-end which will scroll all the way to the end of the document.
Does Ctrl+End work?
@JohnH gave the best keyboard shortcut. Here a some others you might find useful:-
https://help.libreoffice.org/6.1/en-US/text/swriter/04/01020000.html
Thanks all, Ctrl+End works and seems the easiest. 
I’ve made a note, till I get used to it.
Had a quick look at that link @digitracker and the only one so far which might be useful is F7.
Quite pleased that in 76 pages there were only 10 alerts, non of them wrong, but 3 I have adopted as better. 