In reply to Frank Cannings: Hi Frank,
I've done this route a couple of times, most recently last summer with my American friend, Ron.
Ron lives just outside Yosemite NP, and is a pretty good slab climber. I asked him for an American grade for Deja Vu, and he gave it 5.10c. It's interesting to look at one of the grade conversion tables and convert this to English grades - it comes out at about E2!
Personally, I think E4 is a bit high - but English climbers are not very good at granite slabs compared to Californians. Did Hot Henry give an American grade for Deja Vu?
BTW, my friend Ron was 64 years old when he led it. Sickening.
Regards
Andy March