This is so not my thing but I know this is a popular subject for London tourists. Recent article in the WSJ said that there are now several different types of JTR tours offered from differing points of view - it's behind a paywall but I seem to recall some tours skewed younger and gorier, some had a more revisionist and holistic overview of what was going in London at the time, etc.
Which is a long way of saying, if you're interested in a tour, make sure it's the right tour that will interest you.