At 16:51 local time, I saw a bright light in the sky (just after sunset when it was still daylight): either STS or ISS. I couldn't see the other.
BUT THE NEXT PASS!! Wow!!!!!!!!
I was in cellphone contact witha friend of the astroclub who lives 100 km south of Antwerp, at 18:25 local and he says he saw Endeavour at the zenith: I look and see the same; then, 20 seconds later, a flash 2 degrees behind the Shuttle (he sees the same flash): one of Stashine's mirrors hit our retinas. Just before the Shuttle entered Earth's shadow.
3 minutes later came ISS, brilliant as ever and still shining about 10 degrees further than the Shuttle did: bacause ISS was higher and is larger.
Great moment! The first time I see Starshine produce a flash.

Raoul