First, many thanks to everyone who has contributed. I live in North East England, nr Durham, and want to go to the southern-ish region of Scotland, i.e. not the Orkneys/Lewis etc.
I am not on Face-ache and never will be but thanks for that. I have made a list of all festivals mentioned (wow, did not think there were so many!), and will do a thorough search on all of them.
J Campin's post was the most informative, as good to know layout and stuff going on in pubs etc, I hardly ever pay for concerts, mainly looking for freebies - park up, have a wander etc.

Any further insights re these or other festivals much appreciated. Again many thanks, one and all.