When it pays to get a London Pass.
Skipping the queues, but also just not having to do the individual entrance tickets each time is a big advantage. In addition, you don't have to handle cash and it undoubtedly helps to overcome language barriers. Especially for short stays it allows you to see what you would not be able to see in the normal queues and time wasting at ticket offices. These advantages are difficult to monetise, so let's see when you start saving money.
2-Day Pass:
you start saving money after visiting 5 of London's major attractions; but without queues you can definitely visit more (say 3 per day).
3 Day Pass:
Visiting 4/5 attractions will already cover your budget; visiting just 3 per day will save you over €128.00.
6-Day Pass:
The absolute best value for money: unlimited visits to attractions and sites for less than £18 per day, even cheaper than a single entry to Hampton Court Palace, Kew Gardens Thames River Cruise & Wimbledon Experience Tour. It's also worth it if you're visiting London for 4-5 days. Visiting three attractions per day can save you over €277.00.