Leisure Pass Group are the folks that manage the London Pass (and the Paris Pass, Dublin Pass, etc). Basically you buy a specific # of days (1, 3, 6) and during that time you're free to do any/all activities on the Pass. You can only do each attraction one time though.
We used the London Pass (6 days) on our recent trip and found that it saved money but not always time. For the most part, you couldn't skip lines or anything. That said, it was super easy to use - they have an app and you have a QR code - scan & done!
In terms of value, you have to be strategic as its consecutive day use (a 6 day pass is good for 6 days in a row starting from 1st use) so save "free things" for non pass says. Having open access also allows you to pop in and check a thing out randomly with no headaches about paying extra or feeling obligated to get your $$ worth.
Most of the "top" attractions are on the London Pass except for the Eye and Madam Tussauds. It does include things like the Shard, the Tower, Westminster Abbey etc. Definitely do the math on what you want to see for sure and make sure it justifies the price. And check online for discount codes - we saved 15% on the Pass and roughly £170 between the 2 of us (over and above the Pass price).
For us, it ended up being an overall value and saved us a good amount of $$, plus we definitely did things we wouldn't have without the Pass (pay £30+ to go up the Shard? No way!) IMO, the Travelcard option isn't worth paying extra for as it really does not offer any benefits over getting an Oyster card.
If there was more skip the line access, it would be 5-stars. read more