We've tried very hard not to use frames, but can't see a better way to make this survey data index work to let you flip between survey data files on-screen without dropping out of a browser (since survey data files are not in html). Your browser doesn't cope, and we do hope you won't have similar trouble anywhere else on the site. If you click HERE, you will be taken to the index proper. Please use the appropriate mouse button ("adjust" on RISC OS machines, often the middle button on Linux) to follow the links to the survey files. On RISC OS or Linux, this will take you straight to the file. On a two-button machine (PC or Mac), you need to pop up a mneu and choose "open in new window". This should ensure that the index itself stays on-screen and avoids using the "back" button and re-rendering the (large) table each time.