This is popular when available. As supplied by this company to the National Trust and English Heritage.
It is sold in widths of (in inches) 6 and a quarter; 7 and a quarter; 8 (possibly 8 and a quarter if it can be obtained
out of the beams which are usually a maximum of 9ft),
this wood can be stained to look like oak and then given a slight sand and sealed. This type of floorboard is popular as an alternative to oak, which is a lot more expensive.