The difference between 1/32 and 1/35 are minor. In particular the difference in scale for figures can be put down to natural variations in the human population. For vehicles, as long as you don't pose two of the same type, from the two difference scales side-by-side, you'll never notice the difference (and anyway, how often do two difference manufacturers get the same object the same size?). In the case of the Old Bill, there is no other manufacturer that I'm aware of, so I wouldn't worry about it, overly much.