I travelled through Victoria years ago on my way from Brighton to Alsager. Ten minutes after I passed through, a bomb went off in a litter bin on the Eastern side.
If it's your time it's your time. I would go to Wembley myself.
The first IRA bomb in London in the 1970s was planted in a car very near to New Scotland Yard, but an eagle-eyed young PC spotted the car's registration seemed 'wrong' and the bomb was defused before it could go off. I was working round the corner at 55 Broadway, though we knew nothing of the incident at the time. A year or so later I was working for Camden Council in a building just off the Euston Road when I heard a faint noise from outside ( sounds from outside never normally penetrated) and knew instinctively I'd heard a bomb go off, at Euston Station it transpired. Another one went off at Kings Cross around the same time, but I didn't hear that one. Some time later I heard from my house in Hither Green the East Greenwich gasworks bomb explosion, and saw the sky lit up with the ensuing fire. I was also in the area when a bomb being defused in a Wimpy Bar in Oxford Street blew up and killed the poor guy working on it. Lastly, I was on my way to a job interview and got stuck on a train between New Cross and London Bridge for about ninety minutes, to discover that a bomb had gone off on a train at Borough Market Junction in the morning rush hour, thankfully with no casualties as it had detrained its hundreds of commuters at Cannon Street and was coming back as empty stock. The sight of that carriage with its roof peeled back like on a sardine can will live with me forever, because nothing had prepared me for it. No announcement had been made at LB, I think there may have mention of an 'incident' causing the delay! No mobile phones, let alone internet!
The point I'm trying to make is that you have to go on doing what you normally do, not only because otherwise the terrorists have 'won' but also because it is irrational to assume anyone has the faintest idea when or where they will strike next. It has been over ten years since that awful 7/7 day, and other than the abortive attempts of 21/7 and the now-forgotten attempt to blow up a nightclub near Piccadilly Circus there have been no terrorist incidents in London ascribed to Islamic fundamentalism, which in a way is a remarkable record.