London Upgrade/Rating Issue

[delicate flower]

Or you need more point to unlock this items or you didn't unlock the first item in the tree.

[jaunty geyser]

The orange column on the left is important, gotta unlock the tier 2 orange stuff first. Then tier 3 will be unlocked.

Would be nice if this was clearer though. It's explained under the yellow question mark thing but expecting the player to read all that is a bit much I think.