Is the London pass worth the price?
I've never bought one because it included a lot of attractions I didn't want to see. I got the impression that it was a way to capitalize on "visitor enthusiasm" and to enable the concierge to make some bucks, too. Look into other passes. They may be a better value.
There are several reasons I don't think it is worth the price. You would have to be on the go constantly to get your money's worth for atrractions that have an entrance fee. Many major museums in London are free. The transportation option with the London Pass covers zones 1-6. Except for getting to and from Heathrow, you're not likely to travel outside of zone 2. There are cheaper transportation pass options.