LMS stationery; E.R.O. number query

[Bogallan]

I came across this LMS pen knib in the back of a drawer today. The ERO number 90383 identifies the item in the LMS ordering stationery catalogue I am guessing, but what does E.R.O. stand for?

 

[Senex]

"Executive Research Office" — set up in the big re-organisation at then end of the 1920s.

 

[Bogallan]

"Executive Research Office" — set up in the big re-organisation at then end of the 1920s.

Thank you, Senex, looked everywhere for it on the internet. Cheers, Andy