Hi Wendy,
I am looking for the same thing as my builder has inadvertently thrown my manual away. I found this link during my search:
http://www.worcester-bosch.co.uk/cache/file/135/24-hour-digistat-instructions.pdf
I think my boiler is an older version though, as my timer looks completely different but hopefully it might prove useful to you.
nickim, October 2008