Bowsider wrote:
I am putting down a floor in a C shaped corridor. The landing off the
top of the stairs is approximately 1.5m wide and 5m long - the stairs
lands roughly in the middle. There are two corridors running off each
end of the landing at 90 degrees, these are also about 4m long and
around 1m wide. What do people think is the best orientation for the
boards? Thanks in advance.

The conventional standard is lenghwise with the longer dimension.