yeh but as i said , the book says "use of the speedbrake between the down detent and the flight detent can cause rapid roll rates and should normally be avoided" , so the Skipper I was flying with took it to mean any setting in between should be avoided, which sounds in line with the book.
No training Cp has ever mentioned it to me , and ive seen experienced lads use it at various settings but does anyone know the correct procedure