Evidence has been found that confirms alterations were done to the Oak Room. For example, there is evidence of different surface coatings on the room's oak features.
The 'original' stain seems to have been covered by a white layer. Then yellow ochre with fake graining was applied on top of that. The layers can be seen where the timber has been damaged, or where electrical sockets were fitted.
Some of the pink glass decorative features in the low-level panelling on the external walls seem to have been over painted with blue at some point.
Light would have filtered through these panes, so this change in colour would have affected the appearance of the room.
Another area of the room seems to have been tiled and used as a servery.
There is also evidence of replacement panelling – thin oak veneer ply with oak side strips has been used to imitate the original solid oak panelling.