It was E2 6a in the red guide, so probably classic HVS 5c bollox in the older guide, in the same vein as every other HVS 5b/c micro-route on grit that are always far more dangerous than E2 5b slabs with good gear at half-height.
It took me 3 or 4 visits to psyche myself up to do it as a solo rather than a highball....