Hi, I've a big muso pal in Newcastle (I'm in Glasgow, but would enjoy a day out with him watching bands) and was excited by this - but did you mean Nottingham, rather than Newcastle?
I agree for the benefit of the person you replied to, that UK festivals seem fairly bland and provincial once you've been to a few European ones. Primavera (Barcelona) was always the champ but the horrible over crowding in 2022 has put me off and the line up this year indicates a sea change (I appreciate the headliners but I also know they are chart fun for folk 20 years younger than I am - the fest no longer wants me to attend).
Standalone days at the Athens and Lisbon fests (can't recall their exact names) may be worth checking out (e.g, Athens last summer had The Smile (sadly had to cancel) and Pulp on the same bill (!)), and I have had great times at city gigs/fests in Gothenburg (Way Out West) and Helsinki (FLOW) in August (August seems to be a pretty good weather month in Scandinavia, maybe better than the UK).
I have ruled out Bilbao (spelling?) and Primavera (Porto) due to likely rain, the German and Netherlands ones cos they seem to be in forests (meaning camping), and Sziget just because the line ups seem so random and not for me (e.g. always stuff like Muse, Robbie Williams..). Hope this helps 🙂