It's at the Epsom Methodist Church (Multimap here, postcode for the satnav-enabled is KT18 5AQ). The best place to park is at the Ashley Centre multi-storey just round the corner.
Opening hours on Thursday and Friday are 10am - 8pm, Saturday 10am - 4pm, entrance 50p.
As far as the SF goes this year, there's the usual wide-ranging selection, but special mention goes to the several people who appear to have donated their entire collections of Anne McCaffrey, to the extent of a box and a half of her books...
Be there or pay full price for your summer reading.