you can get the information on all the major indices from a site like www.inverline.com, but it will only show it on a graph as far as I know ; although you will be able to manually get the OHLC figures, I dont think you can automatically export it - but its there for free, just depends what you want to do with it.
otherwise, the only way you'll get it is by paying for it i guess - try "historical FTSE data" in Google or something if you havent done so already, and see what you get. Someone out there probably has it somewhere in an excel spreadsheet, just a matter of finding them.
Edit:looks like someone beat me to it with a better answer!!