"Not strictly the school, but this photo taken at scout summer camp in 1988 features a number of Purley boys including Robert Byatt, Robert Hosker and Graham Southwell. The camp was held at Goathland in North Yorkshire, a village that was shortly afterwards to gain fame as the setting for ITV's 'Heartbeat' series. The boys belonged to the 20th Purley Scout Group, a popular choice over the years for Purley HS boys in Coulsdon, but which sadly closed in 2007."
Thanks to Martin Jones for this.
Click the photo to see it full size.