Obviously a bit speculative, but I think we should leave this at E12 for the mo unless some new info surfaces. This is based on plumbing it into https://egrader.co.uk/ with Connor's proposed 9a+ and assuming it's 'slightly runout' or 'runout', which feels fair based on what's been written about it.
No argument from me. Well-protected 9a = E11; it's going hard E11 at the very least.
Should probably have added some context to my original post. It was in at E11 and @cfoxwhelpton upgraded to E13, so posted this as a place to discuss it and hopefully avoid too much swapping about of the grade.
No probs, lot of uncertainty with the grades of new stuff so a bit of discussion is usually good.