Isnt Ilford technique first minute continuous agitation?[/QUOTE]
I checked the Ilford data sheets again just to make sure I hadn't misread them. It definitely says 10 secs agitation( four inversions) initially then 10 secs every minute.
I imagine that a whole minute of agitation( so 50 secs more than recommended) initially then following the Ilford recommendation of 10 secs agitation every minute would produce different negs.