In the Southern UK, there should be a good view of the ISS tonight, with the shuttle Endeavour chasing it along, to dock with it tomorrow. Last night's ISS transit was slightly spoiled by the cirrus that is still drifting around, but it was still plainly visible.
For those of us living just to the west of London, the ISS should appear, virtually out of the west, at 22:31 LOCAL and fly virtually right over the top. Endeavour should appear on the same track (of course) three minutes later. Cloud permitting, there should also be good views over the next few nights. Go on - it's the kid's holidays, let them stay up!
For other locations see:
http://spaceflight.nasa.gov and look under 'Space Station' and then 'See the ISS in the Night Sky.'