To fix the issue of the following first image try to delete "context.xml" and "SceneryIndexes" and restore the name of "Orbx-cityscape-sydney" folder before you launch MSFS.
(aero_orbx-cityscape-sydney -> Orbx-cityscape-sydney)
I have the same lading problem. It just stops loading at about 2/3.
Without London Landmarks Pack, no problem.
I doubt it is only for the users who purchased from MS Marketplace.
Whenever I load EGLC the loading bar stops during its loading.
When I delete the London Landmarks pack, no problem.
I doubt the loading problem is only for users who purchased through MS marketplace. (But I'm not sure.)
I put this issue to their zendesk.
I also posted it to their forums. Please press the vote button on the followin link so that they can recognize the issue.
Sky Garden building in London is facing the opposite direction - Bugs & Issues / Scenery - Microsoft Flight Simulator Forums
I found the Sky Garden building is facing the opposite direction in UK world update. https://forums.flightsimulator.com/t/sky-garden-building-in-london-is-facing-the-opposite-direction/384090
Could you fix the direction of the building? The building looks like duplicated with default one in above 13th image.