Both 5151 and 5140, former TH Properties NABIs, had there wraps removed in the past couple of weeks. Although they haven't been repainted (and look horrible cosmetically), 5140 was spotted with another ad this morning.
Later, 5658 was missing its wrap as well, and most likely 5657 is in the same state. The ending of the TH Properties bus wrapping compaign ended after quite a few years (and buses) of wrapping buses, which included the late 3487 and 3488, as well as two other Neoplans before them.