The London Pass definitely needs to be evaluated before just buying it outright. And Websites for sights (which their App has links to) can help - actually, are essential - for figuring out the everyday admission prices, hours, and closed days of sights. The Shard view, which I’d never pay £30+ to do on its own, was included in the Pass, so it was already paid for, and was a very nice view. The ridiculous photos they took of us, with the option to purchase memories with a bogus background, was more amusing than offensive.
Other things on the Pass, many which we didn’t visit, were three football/futbol/soccer stadiums - one had an adventure climb where you harnessed up and walked the skyway over the field - a full day hop-on-hop-off bus, a full day of Uber boat, which would get you to/from Greenwich, plus several Greenwich sights and museums. St. Paul’s had a dedicated express line for London Pass holders to get in, but Westminster Abbey sent us to stand in a 40-minute queue. There’s Hampton Court Palace, Kew Gardens, and Windsor Castle, Kensington Palace, and the Tower of London. The Transport and Postal Museums, plus Charles Dickens, Florence Nightingale, and the fascinating Ben Franklin House. Globe Theatre tour (highly recommend), the Cortauld Gallery, and lots, lots more.
The King’s Gallery (which still has Queen’s Gallery etched into the stone above the door - some things need time to change - is expensive without the Pass, but a deal with it, same with the Royal Mews just down the street. I didn’t know about the Garden Museum (and its cafe, which overlooks a wonderful garden that includes the tomb of Admiral Bligh of Mutiny on the Bounty), but the London Pass made for an outstanding visit there. The Pass won’t be for everyone on every visit to London, but it sure worked for us last month.