I had planned to go to London on 7/7 to meet my friend who lives near Elephant and Castle tube station. I was going to leave Oxford early that morning about 6am, and get into London about 8.30. I would then go to Edgeware road and get a tube around 8.45, where I'd go around to Embankment, and down to Elephant and Castle.
The night before I wasn't feeling great and couldn't get to sleep, and at 3am or so I decided against going the next morning.
When I woke up the next morning I saw on the news that the 8.50 tube at Edgeware Road was the one that gone blown up.
I don't believe in premonition or anything like that, but it sure was a lucky escape