In reply to Jus:
Bizarrely, having given this route E7, James says this on jerseyclimbs.com...
"I worked the route quite extensively, maybe spent 15 / 20 hours on it (took at least 10 to even work out the crux), but for an onsight, i think it would be more like e8 due to the very hard to read and unlikely nature of the sequence."
So you may be right and it may actually be E8 being as the E grade is supposed to be specifically for the onsight!