I also am having issues with the London landmarks and SU5, when I press fly the loading bar get to around 2/3s loaded then hangs, no activity in task manager. Disable the London landmarks and it loads fine.
Tried a complete uninstall and reinstall of the entire sim, no joy. I’m also using Orbx EGLC and the UK world update.
Ryzen 3700x, 32GB ram and a 6700XT if that helps!