There are two reasons as to why a woodgrain externally and smooth white internally sash window does not have a tilt facility; 1. The bottom channel of the top sash has fringe seal in it so the white base profile is hidden and as you cannot have 2 materials in the same channel the tilt arms cannot also run in this channel. This means that the sashes simply cannot tilt as they don’t have tilt arms. 2. There is foil applied to the bottom of the outer frame and if the window tilted the foil would be ripped off.