I did this today and agree that it's absolute quality - nice one for (re?)discovering and cleaning it Tom! With pretty much dry (and not at all scrittly) holds it felt like fairly straightforward 7A. With the old guide in front of me I think the project it mentions is directly up the arete right of the side-pull which would make this the V3 "SD. Climb wall to the L using arete and sloper" except the side-pull isn't a sloper and it's not V3 . If Brimham regulars told you it hadn't been done then I'd guess it was just a mistake in the guide (like the V7 arete left of The Titfield Thunderbolt). Either way it's brilliant and deserves a name - unless you want it to become Tom's Arete!
Bonjoy, is superglue fine on grit? Ice used it on Sandstone - but there was the odd crumbly flake at Cows Mouth on Sat that could do with saving... (Patina worn through etc..)