Re: Tilling-Stevens radiator logo.
From the pictures we have seen of the TTA2s, "DG452" (whatever its registration ended up as), O9913 and O9923 have the "classic" logo; O9926 and O9932 have the "small ellipse" logo, seen most clearly in the picture in Midland Red Volume 1 (page 24 lower left): perhaps Lloyd will be kind enough to upload this picture.
Re: Tennant Street garage.
Midland Red Volume 2 (page 138) has two pictures: [upper right] eight TTA1s (including O8204) lined up outside the garage c 1912; [lower right] the garage "staff car" (horse and trap) in 1906 with performing dog - this picture shows some interesting signage. [Uploads, please, Lloyd?]
There's another mystery concerning TTA1s O8200-8212 and TTA2s O9913-9936: who built the bodies? Midland Red Volume 1 unequivocally says Thomas Tilling, whereas BMMO Volume 1 says Brush in one place and "Brush or Tilling" in another. Is the MR Vol 1 statement definitive, Lloyd, or is there still some doubt about this?