London Pass (020-7293 0972; www.londonpass.com; 1/2/3/6/10 days £69/94/114/154/184) Worthwhile for visitors who want to take in lots of paid sights in a short time. The pass offers free entry and queue-jumping to all major attractions, and can be adapted to include use of the Underground and buses. Child passes are available too. Check the website for details.
You can download the app to your smartphone or collect your pass from the London Pass Redemption Desk, near Leicester Sq.
Historic Royal Palaces If you're a royalty or palace buff, taking out an annual membership allows you to jump the queues and visit the Tower of London, Kensington Palace, Banqueting House, Kew Palace and Hampton Court Palace as often as you like, making you a fair saving. There can be a lengthy wait for membership cards, but temporary cards are issued immediately.