In reply to Arran Turton-Phillips:
My Valley trips were all in the Seventies so probably not valid now, but during my second visit in 1977 I climbed entirely with people I met around Camp 4, mainly Americans. You could pin a notice to the ranger shack to request partners, lifts, sell kit or whatever. Routes included Half Dome direct NW face, Steck/Salathe and Leaning Tower plus multi-pitch classics on Middle Cathedral.
In 1978 I had an agreement in principle to do Salathe Wall with Howard Johnson, made in the Padarn, and we met up for that and the NW face of Sentinel, the rest of the time was casual pickups of like-minded climbers hanging around camp, Brits and Americans.
You will be fine, I suspect.