HD has the answer! Heavens above is a truly magnificent resource for anoraks, teachers and those with an interest.
The location database is huge and the passes are to the second, as predicted. None of the hassle of updating epoch/TLE files every few days, as required with most of the PC based Sat pred progs.
Brillo - and free!
Whilst we are at it - I was there a few mins before finding this thread and looking for ISS/Shuttle passes, when I found this, which although off topic is a neat idea....
http://www.heavensabovefireworks.com/
Conan