Although tourists have their fair share of choices on which tour company they want to book, I highly recommend the company we went through--tickets were only 8 pounds apiece and the tour guide, Richard Cobb, got straight to the important and most gruesome details without droning on and on about the non-important. Also, Mr. Cobb used a hand-held projector to portray pictures of the murders, events, and historic recreations. We'll throw up a deuce sign to Richard for scaring us silly!
Check out the company's website here: www.thejacktherippertour.com.
Take away: make sure to use the loo before the tour--there are no bathroom breaks. Poor Mr. Umbrella had to run into an alley. First day in a new country, and I'm at risk of dating a "public urinator".