The International Space Station is visible again from Fri 15th for the next 10 evenings.
Tonight should be particularly good as it's for 6 minutes
Fri May 15, 10:50 PM - 6 min - rising from the SW
Try these various links and/or select your own location.
NASA page for London
ISS - Visible Passes 10 day predictions for London
ISS Interactive 3D Visualization
NASA ISS Live Stream - Earth From Space
This one is quite interesting because if 'LIVE NOW' is at the top left it's LIVE. Otherwise, as the Space Station goes into night every 45 mins, the video stream is unavailable. During this time, and other breaks in transmission, recorded footage is shown. When it's back in daylight the live stream should start again.
Let's hope for clear skies - Good Luck!