Status: Still in existence (as far as we know, but not recently checked)
Address: 72 Charing Cross Road, WC2H 0BB (osm) (gmap) (bingmap) (streetview)
Website: Website
Twitter: @QuintoBookshop
Notes: It used to be at 48A Charing Cross Road (photo), but moved to number 72 on 23 March 2010. The building also houses a branch of Francis Edwards.