Over reaction on your boss's part Craft1948. There are far too many scare stories about regarding London and where's safe and where isn't.
Street crime is at a very low level, this is official figures published last year. It just doesn't serve the likes of the Daily Mail to report that. There are elderly people all over the place who are terrified to go out after dark. This is as a result of shock horror reporting. One crime happens and it will be bound to be reported. Millions of people go out on London's streets every day and night and don't get attacked.
There is nowhere in London that I would be bothered about wandering about, during the day or at night. And I'll never see 50 again.
Come down here and enjoy your stay
Have a nice trip