A UK passport (or other) will satisfy the requirement to carry photo ID.
Interesting points about the photo ID in the US. I was once refused a bottle of Vodka in a supermarket in the US even though I showed my passport. Wasn't company policy to accept a passport as proof apparently??? (work that one out) On the other hand I was refuesed entry into a bar in Pacific Beach even though I produced my UK driving licence. The young lad on the door said that only California driving licence / state ID or a passport would do....
Oh well, I suppose thats what you get for having such youthful good looks
Cheers
EA