Brixton Garage so far
Now, before anyone gets too excited about anything shown on the blinds, I should add a small explanation:
Firstly, what you don't see are the further 14 route numbers that come after the National Rail logo, these cannot be selected except via the menu as they are AI-only routes from operators the player doesn't drive any routes for.
The remaining route blinds you do see are from the 4 major operators the player drives for. They are grouped by operator (Arriva, Abellio, Metroline and Go-Ahead) and then by depot; and each group is inter-spliced with black and white blank blinds and (where applicable) operator logo blinds.
Every player and AI route from those 4 operators is on the blind roll, along with some others. The others are from depots the player drives for; for example: the first block of numbers is QB (Battersea) garage for which the player drives routes 3, 159 and N3 and the AI drives route 211; but QB's other routes (49, 156, 344, 414, 452, C2 and C3) are also in that first block. The last block in each operator group contains the AI routes from depots the driver doesn't drive for, like the block that contains only the 109 which is an AI route from BC (Beddington Cross).
Front and side blinds are less confusing, only destinations you'll see on player or AI buses will be featured, with the exception of a few generic blinds at the beginning of the blind roll.
Oh, and before anyone suggests "why don't you make them all", there are about 780 bus routes in London, which means you have about 1,600 front displays and around 6,000 side displays. I think you'd prefer me to work on other things than powerblinds for routes you can't drive.