Try contacting / calling in to the climbing shop in the nearby town of Manzanares El Real they may be able to help. I climbed there in July in 38°c and had some fun between the big runouts of the spaced bolts. We didn't see any other climbers around, just us keen and slightly mad Brits on the friction slabs at the wrong time of year!
Hi phil456, I run a small business in Spain guiding and teaching lead climbing (sport and trad), but only in the winter, usually mid Nov to end of Feb. I will be there and have a few dates left for this winter. Please contact me if you're interested. Visit my website www.climbcostablanca.uk